五年级计算题天天练
曼珠沙华的传说-七年级英语试题
Part1:口算
×= 5÷= +=
+=
+= ×= ÷12= +=
Part2:脱式计算
×99+25×
× （）÷ ×4+÷
Part3:解方程
4×χ＝
χχ＝
χ÷＝8
8χ＝4
Part1:口算
×4＝ +＝
÷40＝ ÷＝
+＝ +＝ ×＝
310÷50＝
脱式计算
（+）×
×20+
×[（）÷] ××
Part3:解方程
χ÷＝
χ＝3
χχ＝15
6÷30＝χ÷
Part1:口算
169÷13＝
90×＝ +＝ 156÷40＝
8×＝ +＝
135÷30＝ +＝
Part2:脱式计算
+（）÷8
×+×
×
48×
Part3:解方程
χ＝ ÷4χ÷χ
（χχ）÷＝ 4χ＝
Part1:口算
+
1
＝
2
-
＝ +
1 1
＝
+ ＝
1
2
3
3 4 3
+ = + =
+ = - = + =
5 1 7
5 3
12 6 12 8 7
Part2:脱式计算
-
8
（ +
2
） + +
1
9 9 3
2
9
+ + +
-
4 2 1
5 9 5
（ + ）
1
＝
5 1
6
8 4
3
4
5 2
6 7
4 11 3
5 15 10
17 7 5
20 20 12
2 1
3 5
2
5
5 8
-
Part3:解方程
χ+ =
3 3
χ- =
5 3
7 4
12 8
χ- =1
5
χ- =
4 5
6
5 12
Part1:口算
- =
1- - = + -2= + = + -
=
1 1
1 1 1 7
2
10 20
2 5 3 3 5
- = - = - =
+ = + =
1 1 1 1 13 2 9
5 2 4 5
15 5
7
Part2:脱式计算
+ + =
+ -
4 1 1
1 1 1
5 2 3
2 3 4
+ -
2- -
5 5 5 5 13
7 6 8
12 15
1 1
10 4
1 3
6 5
2 1
4 5
2
3
Part3:解方程
χ
2
χ
+
2
=28
χ=45
3
5 5
χ-
= +
1 4
2 5
χ=
Part1:口算
- = + = + = - =
- =
5 3 4 2 3
6 8 5 3 7
- =
+ = + = - = - =
1 1 4 7 1
2 12 9 8 6
Part2:脱式计算
+( - ) - +
4 3 3
5 7 8
11 7
12
-( - )
-( + )
1
12 2
10
1 1
6 2
3
1 1
8 8 12
5 5 2
9
6
15
5 1 5
8 3 12
8 2 1
9 9 4
5
1
4
4 2
7 5
12
Part3:解方程
2χ- =
χ+ =
5 1
6 6
1
3
6
7
7
-χ=
1
χ-( - )=
7
12 4
16
Part1:口算
3
×
=
5
÷ =
3
÷ =
3
×30 = + =
5 1
4 6 10 5 6 6
÷= ×= ×= ×
×14= 9-2÷8=
Part2:脱式计算
（ + +
5 1
）×
3
72
（ - ÷ ）×
12 9 8
5
6
÷
[( +
)
2
3
×
3
]
3
4 34
÷( - )×( - )
Part3:解方程
2
χ
- χ
1
=
14
χ+=
5
6 15
5 7
24
24
2 3
5
3 1
7 3
4
1 7
5 48
4 5 1
9 62
1
6
5
19
5 1
62
15
1 -3
1
4
χ= 1
1
2
÷4=÷χ
Part1:口算
÷= +1 = 3 += ×8=
1
÷=
4
4 5
=
- = ÷ = - =
1 1 3
4 5 5
× =
6
7
Part2:脱式计算
9 ×
5
+4 ×
1 1
× + ÷5
6 4 6
48×( + + ) ( +
)
5 3 7 3
6 612
×6+
6
Part3:解方程
2χ+=
χ- χ=
4
9
2
5
4
5
4 6 1
5 7 5
7 7
12 13
10
21
3
4
2
3
1 2
9÷χ=
1
÷χ+ χ=42
5
33
1
2
Part1:口算
305-199=
+= += 8÷= ×4=
5
6
+ = 12
1
9
÷
= + =
2
3
÷ =
+=
2 1
5 6
Part2:脱式计算
11×( +
)
2
×
1
7
×101-9÷25
11 7
560÷16÷5 6÷ -
÷6
Part3:解方程
4
+χ=
5
χ- =
9
6
2
5
3
4
9
25
6 6
7 7
3
10
4
1
9
2
1
6
3
8
4χ- = ÷χ=7÷
Part1:口算
7
×
=
+ = = =
8
1
4
2
3
2
5
5
6
×= × =
3
8
÷
4
21
= + =
- =
Part2:脱式计算
（ +
14
）÷
7
10
7
÷[ -(
15 24 2
3
×
[ ÷
8
( +
)]
5 3
8 9 6 4
÷7+ ×
Part3:解方程
12÷14=χ÷ χ- =10
÷χ= χ÷=3
2 5
9 18
+ )]
2
9
8
3
4 6
7
1
5
5
6
5 5
26
4
11
3
3
4 8
2
5
÷
11
13
Part1:口算
=
× = + = += +=
3
7 3 2
4
1
4
3
5
6
5
5
6
5
8
1
3
3
7
1 4 1 1
=
1
=
+ = - = - =
÷
3 9
Part2:脱式计算
24×( + - )
( + - )
3 5 2
4 6 3
( + )
4 1 7 7
5
÷
4
+ 68
3 10
3
÷χ
=÷
2
χ+ χ=
1
5
7
30
Part1:口算
×50= +=
+ =
2 3 9
3 8
÷3=
11
Part2:脱式计算
÷ + ×
6
5
5 6
×30
2
5
×
解方程
χ- χ-5=18
2
3
÷ = ÷χ
2
5
×= ×8=
× =
+ = + =
3 2
4 3
÷(1÷ +
3 1
2 10
1 2
6 15
3 2
4 5
2
5
1 1
4 5
7
5
(736÷16+37 ) ×18
( + - )
5
÷
1
6
Part3:解方程
3
4
χ+
1
6
χ
=66
÷χ=÷
4
3
χ- χ
4
5
- =1 =
1
5
÷
χ
Part1:口算
×104= 736+37= ×=
×5=
2
+= 3
3 5 2
5
÷ = + = - =
- =
4 11 3
Part2:脱式计算
( + - )
7 5
÷
[ -( - )]
2
1
×
5
15 6 5
30
6
8 12 24
3
8
5 2 7
14 7 18
2
9
2 1
5 4
2
×
2
( - )
7 5
( + )÷[ ×( - )
3 9
8 16
3
4
5
7
3
5
1
4
Part3:解方程
3
χ
- χ
1
5
=
1
510
χ-2χ=18
9χ+= ÷ = ÷χ
Part1:口算
14÷35= += ×4=
+ =
3 1 6 4
4
+ =
+ = - =
3 7 5
×
Part2:脱式计算
2+÷
+
8
7
×
9
32
× + +
3 1
20 2
1 2
2
×4+4
5
× =
3
8
1
6
5 14
7 15
4
1 3
5
5 8
4 1
5 5
=
Part3:解方程
3χ÷=
+(
3
χ+ )= χ+
5
9
10
(χ- )÷ =
2
χ- =χ+
5
Part1:口算
3×= 7÷= 18÷360= + =
8 =
1
2
2
×
=
81
3
÷ = - = + =
9
4
14
×
3
15
5
2
=
Part2:脱式计算
÷
1
[ -( +
)] ( + - )
15 4
1
÷
2 11 11
5
1
4
×14-
2
3
4
5
3
5
7
1
12
5
5
1 5
6
4 12
3
4
4
5
15
11
1
1
5
12
Part3:解方程
+χ- =
+ χ=
(
11
7
12
χ
+=χ-
×(χ
30
=χ
+
Part1:口算
+= ×= 135÷30=
= × = 5
Part2:
9
14
脱式计算
4 3 2
9
8 15
56
÷
1
27+8 × ××8)÷
13
1
7
[7-(1 × +1 × )]
3
÷
125 -(11 -4 + )
4
4
9
3 5
4 9
Part3:解方程
1
×3 = × =
25
11
121
50
7
8
3
4
3
20
4 3 7
5 8 2
31
100
× =
4
3
9
16
7
20
12÷(χ+ )=
χ- χ=
=
χ+ χ= 42
Part1:口算
+= +=
1
-
1
7
= + =
- = + =
1
2
5 2
7
Part2:脱式计算
2 +1
1
×
3
2
2 6 -1
7
3 10
10
5
2 - 1 +
1
1
6
÷
6
3
Part3:解方程
1
+2χ=
5
1
4 2
1
3
×
÷
χ-3× =
1
1
8
1 =
24
1
8
3
2 2
4
7 3
1
7
6
7
12
9
7
7
10
5
4
1
5
3
÷
3χ- ×χ- χ=1
5
=
5
2 9
4
5
3
10
Part1:口算
+= + =
4
1
5
-
3
8
=
× =
10
Part2:脱式计算
16-(9 +
2
÷
1
) (3 -2
3 3
1
12
( -
1 1
10
4
÷
10
2)
× 2
13
Part3:解方程
2(χ+ )=3
1
χ-5
-
2
1
6
÷
5
3
7
= - = +
=
10
× )÷4
×(10-3 )÷
χ- χ=
3
8
2
5
2
3
1
25
14
1
15
4
5
3
6
7
3
1
4
5
1 4
3 5
1
6
1
3
1
2
6 3
90× + χ=20
χ+ =8-1 χ
1
2
4
5
3
5
Part1:口算
1 3
249+49=
= × = + = - =
÷ = - =
4
6 5
3
7
8
3
4
4
5
4
7
Part2:
8
脱式计算
9
4
4
÷
16+3 ×
1
15-3
2
7
2
7
2 -
2 2
9
×
9
2+1
1
2
Part3:解方程
10
-χ=
2
11
3
1
4
χ+
2
3
χ
=121
5 2
9 7
÷ ×2
÷
- ×
+2 =
7
12
χ-(1 + )=
2
3
8
9
1
5
1
5
1
6
3
1
8
7
1 1
55
χ
Part1:口算
7
2 2 1 1
9
+= += +=
94+= ÷ = - = -
= + = + =
7 3 6 3
5 5 5
Part2:
14
脱式计算
8 7
5
6
3
4
8
15
2
5
1÷
+ × )÷(4 ÷3 )
2
×
9
(3
÷2 )
(2-3
1 44
11 11 5 55
1
5
1
7
÷
(1
×
3
+
4
÷
1 )
3 +
7
18 4 7
15
Part3:解方程
(χ+ )×7=
+ +
6
7
χ
=
5
Part1:口算
+=
245+= 183+873=
7
3
8
×
= + =
- = - =
4
1
×(1 - )÷2
5
χ=69
χ-1- χ=2
÷ =
5
16
3
8
5
24
1
5
1 1
2 3
7 1 5
9
2 9
1
2
5
6
1
8
1
6
5
9
3
8
4
7
2
5
2
3
Part2:脱式计算
2
5
1
(1 +6 +2 +3 )×
[9-( + )×24]÷1
3
3
8
3
8
1
12
1
8
3
5
1
1
÷
-1
2
×
2
1 +3
2 +1
4
7
9 9
5 7
20
÷×3
Part3:解方程
χ- +
=
7 1 2
χ- χ=
10 5 3
3
χ
+
3
χ
=11
+ χ=
7 4
Part1:口算
+=
+=
2
33
7
+ =
- =
5
÷
4
=
5
8
× = + =
5
9
Part2:脱式计算
(1
8
×
+5
13
÷ )
5
÷
11
)
8
5
÷(2 +×7
13
42
7
21
8
1
2
5 2 1
6 3
12
1 3
4 4
1
2
1 6 7
18 7
15
4
15
4
5
3
5
1
3
1
2
1
2)]÷
××÷×× [1-(4 ×
3
Part3:解方程
2χ+ =
-2
5
8
7
11
8
-3χ=
+=
16
Part1:口算
+= =
+= + = - = + =
Part2:
3
1
4
6
脱式计算
×+×
×
3
13
χ=
χ
2
2
9
5
×1 ÷1
4
5
1
2
×
1
4
8
9
÷
5
8
3
13
2
3
3
4
=
=
5
113
+886 ×+ 3 ×25 +×6
2
5
2
5
19
Part3:解方程
1
χ
- χ
1
=
6 7
1
1
2
×
3+χ=6 9
1
3
Part1:口算
6
+= 434+147= + = -
=
7
5
1
6
Part2:
5
脱式计算
383
3
×
+79×61
5
4 8
41
1
3
×
+51
3
4
×
1
+61
4
4 5
×
+ =
5 3
8 4
χ=5 ×1
1
5
3
9
÷ =
3 4
5 9
× +×42-8
4
27
÷25
1
5
5
×÷ +2 ×
6
5
9
23
24
2
7
× =
+ =
7
3
9
14
8
25
4
9
3
5
4
5
2
5
2
7
χ
(5 +2 )
Part3:解方程
χ- χ=
3
χ- χ=
5
=χ 1 -2
1
2
χ=
Part1:口算
+=
+= 357+=
3 5
7
3
4
× = - = +
= - =
9
8
4
Part2:脱式计算
(9 +7 )
÷
÷( + )
(4 +
2
9
3
×3
13
5 -4
4 1
÷
5
34
2
8
45 6
÷
15
7
3
5
1
3
1
7
÷
1
=
9
1 1
4 2
1
3
3
4
2
7
2
2 5 5
7 9 7 9
+ +7
2
÷
1
5
1
8
× 3
1
2 5
5 1
6 6
Part3:解方程
3χ- χ
3
=
(1- )
18
419
χ=
4
25
÷χ=
4( +χ)=7
Part1:口算
167-88= ÷= ×= += ÷
= + = + = - =
- =
Part2:
7
4 3 5
9
脱式计算
7
8
9
8 7
( + + )
7
12
1
1
×2
1
×[+ )÷ ]
30 35 63
×[+3 )÷ ]
1
×
1
+215
2
×
3
Part3:解方程
4
÷χ=
2
χ÷ =30
5 7
51
100
4
5
4
5
18
19
5
6
7
8
1
5
1
3
1
3
1
19
5
7
5
6
3
8
1
2
1
3
χ÷ =
6 26
35
÷
45
(
13
25
χ+3)× =48
Part1:口算
+= +348=
- = + = - =
+ = + =
1 2
5 15
Part2:
7 1 1 1
10
脱式计算
3 5
6
[+(3 ×2
2
÷
10]÷3
1 +[2 -(2 ]
10 1
÷2
9 13 8
[2 - )
3
÷]×7
[4
2
3
1
÷
5
2
(2 -1 )-9 × ]×1
Part3:解方程
18
÷
3
25
7
χ
= ÷
7
25
2
6
÷χ=2
35
(13-χ)× =6
2
3
4
χ+1 =2
1
2
1 1
3 4
3 3
4 14
3
14
4 1
7 2
9
11
3
4
5
1
8
12
5
6
1 5
3 21
2
9
1
12
3
4
Part1:口算
=
+= += +=
7 3 3
1
10
-
5
= - =
- = + = + =
5
4
5 1
6 3
Part2:脱式计算
1
7
÷
[2 -
1
×
+1
)]
12
× [2-
1
×
10
3
29
5
×(1 +3 )+
2
÷1 -
[
1 1 3
×
3
6 6 5
- )+4
5
8
÷2 ]÷11
Part3:解方程
χ+(3χ-16)÷ =10(
1
χ+1) 7+χ)=
4
(χ+6)=×
3 χ+χ=25
3
7
3
4
3 37
8 40
4
5
7
12
1 2
2 3
4
9
1
4
Part1:口算
1
11 5 7 2
4
÷= += += + = -
= - = - = +
=
14 11 13 5
3
Part2:脱式计算
8
5 3
[(11 -3 ÷÷2 -1
2
]÷2
2 6
× ÷7+ ×
1
×1 )-8
19
6
2
4
11
17 5 25
9 29
5 13
2
7
3
5
1
5
22
63
3
5
[( +4
4
÷×
3 3
7
8
)÷2 ]
5
÷
4 - +
Part3:解方程
2
χ+1
- =1 2
χ-1
3 3
χ+2
-
χ
=
-3
3
4
Part1:口算
+= += + = + = -
= + = + =
Part2:
2 2
5 5
7 9
脱式计算
11
13
7
28
51
100
χ-
=2+
χ- =2-
4
5
4
9
2
10
13
7
16
7
8
χ+1
2
χ-1
2
3 2
9 7
5
8
1
4
χ+1
2
χ+2
3
1
4
4
5
5
7
2
5
[÷+×6 ]÷×( 1
÷×2
× +× )
5
5 2
27
×
5
24
27
×( + )
5
3
8
Part3:解方程
3
χ×4=
- =50
χ+4
χ-3
4
χ
- =1
- =
χ+2
20χ-10
10χ+30
5 5
Part1:口算
+= += +=
+
= - = + = - =
2 3
× =
11
5 7
12
Part2:脱式计算
( -
1
÷2)× +1÷1
(1 +
1
×1 )×
3 3
3
4
12
5 8
5
5
6
7
12
1
10
3
13
+
6
25 25
÷
+1 ×1
18 11
2
11
9
11
1
4
Part3:解方程
3-χ
-
χ
= 0
+1 =
+4
2 3
3χ-1
2
= -1
- =1
4χ-6
5
Part1:口算
+= += ×=
÷ = - = - =
+ = + =
7
15
Part2:脱式计算
[5-3 ÷
7
(1 +×
5
)]÷ 1
1
8
6
3
2χ+1
χ+5
6 4
χ+2
2χ-3
4
6
1 3 1 5
4
4
6
8
1
× - + )
1
8
3
1
8
2
7
7 1
8 2
(3 +4 )
2
×120
( +1
1
÷ )×2
4 1
16
5 6 9 3
21
4
7
Part3:解方程
1+χ
+χ=3+
- - +3=0
χ-2
χ-2
χ+3
2χ-5
3 4
5 10
3
4
×(χ+10)=
×
1
(5χ-6) + χ
3
5 5
=6
4
Part1:口算
1
985+458= ÷= += =
× = - = + =
+ =
2
4 1 5 9 5 1
15
Part2:
6
脱式计算
12 14 12 8
×3 -1
+
4
×
7
5
1 5
×++2 ×7
3
4
4
4 5
5
3
5
)÷1 + ×
1
3
1
÷ )+ ×
1
1 3 4 7
4
11 2
5 4 5 4
11
12
4
9
7
12
Part3:解方程
χ
=(χ+7)÷11
+ χ=5
χ
3
9
18:=χ:
:
1
4
χ=5:
Part1:口算
×= += += + =
+ =
Part2:
3
16
5
脱式计算
4 3
12
15 10
3
×
)+ ÷ 4
1
4 4
÷ ×(1- )
5
12
×2 ×2 -2
3
3
3
7
7
÷
7
×
+6 ×
8
4
×= - =
- =
5
16
2
3
5
4
3
4
3
9
4
16
1
3
2
3
5
8
4
5
3
10
Part3:解方程
χ+ =240
χ
χ- χ=
5
3
:=6:χ 12:=3χ:
5
Part1:口算
+= +=
÷3=
8 9 2
11
÷
4=
- =
13
÷
5
=
+ = - =
Part2:脱式计算
1
2
×
[7 + )-4 ]
5 1
×
5 -
1
÷
3 6
8 3
+ )
1
÷1 2
3
××3 -1
3
×9
2 10 10
Part3:解方程
:2χ=12:
χ=6
4
5
2
9
1
2
2
7
2 1
3 4
1
4
1
4
1 3
4 10
2
9
3
10
1 1
2 10
3 -+
3
4
χ)= 4(χ=1
Part1:口算
÷= +=
+=
3
÷
4 2 2
1
7
= - = + =
+ = - =
15 9 15
6
Part2:脱式计算
84
1
2
÷
14+16 ×
1
2
-(1- )
( -
1
14
13
14
÷2)×
21× +
3
×
- ×12+
9
×
2
2
4
×(10-3 )÷
7 13 7 13
Part3:解方程
45×(χ-83)=36(χ-75)
48×(34-2χ)=56(χ+2)
3
5
5
3
8
5
1 1
4 10
1 1
25
3
3
5
4
7
10
13
4
5
24×(2χ-63)=18×(χ+16) ×+χ)=×χ)
Part1:口算
+= ×24=
+=
11 5 15
18
-
11 2
1
12
=
× = + =
22 25 11
÷
= +
=
3
Part2:脱式计算
×
3
-
5
÷
1
÷ ÷
4 7 4
+ - )÷
1
1
1
5 7
7
÷÷ )×
Part3:解方程
1
χ
+=1
1
χ÷ =
4 10
2
7
1
70
7
24
1
3
4
10
3
4
5
12
1
6
2
7
1
6
4
11
30
43
2 1
9 6
×(χ+=2
÷χ)=
Part1:口算
×=
+= + = - =
- = × = ÷ =
10 5
9 3
4 3
Part2:脱式计算
7 11
9
11
15
28
12
13
4
39
5 1
4 7
÷×
1 5
5
++
6
( +
)
2
÷
3
5 5
Part3:解方程
8
+
χ
1
- =
+
3
1
9
6
4
6
( +
3
5
χ)×=11
(
3
5
Part1:口算
÷
÷÷ )×
χ÷=6
χ+÷=2
9
10
5
6
1
4
3 4
10 7
2
3
1
2
35
78
+= ÷= +=
1
1
3 3 2
6÷ = - =
+ = × = ÷=
4
9
4 7 5
3
20
8
9
8
9
Part2:脱式计算
+
2
÷×
1
+ ÷ ÷
3
2
1
÷
7
10
×
10
+
×÷
)+
Part3:解方程
10
+
5
χ
=
+
5
÷χ=1
19
8 8
3
×(χ+=3
9
×(χ÷
4
10
)=
Part1:口算
+= ÷= 9-2÷8=
+=
3
2
4
3
4 3
5 4
2 1
3 4
4
7
7 2
18 9
2
3
4
9
1
8
1
4
1
18
3 4
4 15
5
11
5
18
24 25
4÷ =
+ = - = + =
× =
1
8
Part2:脱式计算
1
÷÷ ×
+
2
8
5
1
5
5
6
3
10
7
×
3
)
1
2
×÷ ÷ )
Part3:解方程
5(χ+4)+6=12(χ+1)-7
- =
2
- =
χ+1
1 4
9
3 9
χ+ =
Part1:口算
÷= +=
×=
×
3 2
7
×
3
14=
- =
14
×
1
15 6
÷ =
Part2:脱式计算
1 1 2
8 10 3
- ÷
3
4
5=
( + )
1
10
2χ-1
χ
2
5
3 6
4 2
7 7
×30=
5
6
1 4 1
5 5 2
2
5
3
5
1
6
÷
9 6 6
6
+ ÷ ÷
× ÷
×(
× )÷
4
5
×( × )+
1
6
Part3:解方程
2(χ+1)÷3=24÷36
(χ-1)= (χ+1)
1
2
4
5
χ+=1
χ+ ÷ =
1
3 53
4
7 60
Part1:口算
×3= ÷=
+=
7
×
1 3 6
10
6
= ＋ =
5
6
×
1
10
+
3
9
= ÷ =
24×( + )=
5 7
Part2:脱式计算
1
×
÷
4
+
— ÷ +
3
6 5 10
5
7
6
12
5
8
+
1
1
7 5
6
×
3
(
×
×( × )
8 6
Part3:解方程
12χ: 5=48: 20
(χ+1): 10=(χ-1): 5
(χ+×=
56
χ+ =
4 2
75
5 15
Part1:口算
56+= +=
+=
( + )×6+ = 12
7
÷
2
1
13
= ÷ =
( + )
3
÷ = + =
6
Part2:脱式计算
+
1 1 1 1
8
÷
1
2
+
÷× -
2 4 9
1
3
14
7
15
20
7
2
2
3
××
5 1
6
+ ) ÷
4
5
( + ×
8
Part3:解方程
(3χ+1): (χ+1)=2:1
(4χ+3): 5=χ: 1
7
χ- = -
1 19
χ
14
8 16 32
=
49
Part1:口算
+=
÷50= +=
×
4
+
6
÷
5= + = 6
6
2
÷ = 1
1
÷3×
6
5 7
7
5 6
=
7
Part2:脱式计算
4 ×
7
2 +4
1
×4 +6
2
×
7
4
4
4 7
÷16+3 ×
13 7 7 13 7 13
2
3
5
4
6
5
1
5
9
10
1
4
3 8
7 49
× =
4
7
8
9
1
3
1
2
2 7
3
8
1
7
3 4
8 21
[(3 ÷1 +2 ]÷2
15-3 ÷ ×2
Part3:解方程
- χ=
÷ χ=
11
19
+
χ= × χ=1
Part1:口算
+= ×=
+= =
÷
2
5 9
9
= 56
18
× = + =
- =
14
4
3
9
×
8
=
Part2:脱式计算
33
×4 +× ÷
1
18
÷(3
22
3
+ ×
1
÷2 )
10
25 15
2
2
×
5
(
+ )+
5
6
1
×(2- × )÷
2
4
15
7
3
12
7
33
222
3
222
2
9
11 11
6
5
5
4
1 34
5 55
3
4
Part3:解方程
χ+ =
χ- =
1
3
χ×
38
2 =
χ÷ =
Part1:口算
+=
÷327= =
×
4
5
=
9× + = + =
5 5
6 6
× - = - =
7 1
8
9
Part2:脱式计算
)×1 ÷
3
( + )
1
÷ -
1
20 2 2
(4÷7+
)
1
6
×
6- 2
6526+450
5
7
÷18×101
3
4
8
9
1
3
3
5
1
5
3
6
13
18
2
9
Part3:解方程
3
×(χ+=2
5
×(χ=1
4
12
3
8
×( +
2 4
5
χ)=
9
×(1 χ)=
Part1:口算
+= 491-346= ÷9= +=
7× + =
5 3 3 1
49 14
÷6= 6
8
×( + )= 31× -
= - =
2
Part2:脱式计算
× +
5
×÷
2+
1 (
×4 + )
3
÷ ÷2
21
7
7
4
÷
[( - )
3
÷ ]
36
1
7
5
5
4
10
×( +
- )
5 2
2
17
7
3 7
12
5 8
2 5
5
3
6 6
7 4
18
1 1
2
6
3
7
8
7
12
5 1
9 4
2 5
6 10
7 21
Part3:解方程
÷ χ=
+ ÷1 χ=
10
-
39 7
13 16
-
7
30
÷
14
χ
=
+
37
Part1:口算
+575=
80×= = +=
5
3 1
9
×
18-14× =
7
× +
=
5
Part2:脱式计算
××
××
1
×4 ×
2
×
Part3:解方程
×χ÷
)=
16
35
22 12
÷1 χ=
26 11
35 12
2 5 3
2
4 15 2
3
× + =
6
×
14
+
×
3
=
+
1
6
÷
5
=
16
3
3
4
39×
2
3
÷42
( - )
1
1
6
7
×
4
5
5
×6÷4+×3÷2
2×9÷8+1×45÷4
×χ× )=
9
22
1
11
1
2
4 3
5
7
20
8
4
÷χ÷ )=
7 1
÷χ×
3
9 16 54
)=
7
Part1:口算
÷40=
+= +=
14× -
2
7
×
5 12 5 2 1
17
3
9
6
=
15
× + = -
3
5
×
= 3
3
× + =
32
4
×
24
+ =
Part2:脱式计算
3
×
+
5
× 3
3 6
÷
7
7 11 11 7
[5 ×+ )
20
3
4
1110÷[56×( - )] 10 -(2
3 3
÷1 + ×
1
3
7 8
1 )
6
4
Part3:解方程
5
÷
5
χ
=
3
÷ χ=
3
18 6 5
14
3
7
7 7
9 12
4 1
5 21
2
1
9
3
1
3
3
2
8
5
1
4
2
7
5
3
3
7
25 7
7 11
9
÷χ- =
5
÷χ+ =
1
6 6
12
Part1:口算
+= ÷50= +=
=
1
+
3
3 7
16 1
1
2 2
4
÷
4
=
8
× + = 101
8
21
× -
2
×21= ÷ = 10
1
5
÷
5
+ ×4=
7 5
Part2:脱式计算
÷1
++3 )
1
×2 [( +1 )
3
1
× ]÷
8 1 3
2 4 7 9 3 4
× +÷
4 1
5
× [ +]÷
2
3
2
3
Part3:解方程
χ-2
-
χ
=3 -
=
+1
3+χ
+χ
4χ
5χ
χ
1
2
5
9
1
1
6
12
-
= 7×( +χ)=
Part1:口算
50×= += +=
÷ + = × + ÷ = + = ×
+ = ÷ - =
Part2:
2 2
5
脱式计算
1
2
3
9 9 2 3
5 3
2
5
10 20 9 8
9 10
5
7
×(1÷ -
1
3
÷1)+1
84 ÷14+16 × -(1- )
4 3
3 5 1 1 1
7 4 4 6 2 2 14
÷(10÷×
1998×3÷43×559÷37
×13+169×
1
2
3
10
Part3:解方程
2χ
+
=37 +2
χ=2
χ
χ+1
- =115
- =
χ-3
χ-1
χ
3
Part1:口算
2 2
7 5
1
3
13
14
+= 716-685= ÷8=
+=
× + = + =
6
×
4- =
5 4
×
5
×
5
= ÷ + =
4 12
÷
5
1 2 1 2 2 3 5 4 3
8
5 1
8 6
3
22
9 1
11 8
Part2:脱式计算
+( + )
2 4
5 7
× 2008
1
7
2
25
×
18×( + )
1
×
3
18 25
25
÷ + ÷
Part3:解方程
χ- χ=12
- - =1
4
5
χ
-
+2
×χ+2)
χ= -
=1
Part1:口算
70×=
+= 504-473= +=
1 5 4 3
3
2 12 5 8 4
2
9
2006
2007
3
7 4 7
7
8 7 8
χ
3+2χ
χ
3
χ
8 3 3 2 7
9 4 5
5 5
8 4
7 9
7
15
-
× = ÷ + = × - = ÷ -
= - =
Part2:脱式计算
+
5
×
19
4+
×
21
7
19
( + + )
÷( + + )
5 5 1
1 1
25
25
5
7 9 12 7 9 12
( + + )
11 5 1 4
4
12
7
÷ 265÷
+578× +157
18
25 72
÷
3
3
Part3:解方程
χ
- χ
2
χ
χ
χ
3
= +1
- =
2
χ
=
=
χ+
4-6χ
χ
Part1:口算
6×=
+= +=
= +
4
÷6=
5
× + =
1
÷ - = ×
3
( - )=
1
4 5 4
5
12
2 5
10
9 9
9
12 5
5 6
Part2:脱式计算
5 3 5
3
5 3
45+4545+454545+
78+7878+787878+
1
4
33÷ +
×44+24÷
6 1
7
×
(7+9)×
(
18
× - )×1
Part3:解方程
χ: =21:
5 5
χ×( + )=
15 8
χ-(2 +=
2
1
4
7
12
χ-5 =
Part1:口算
+= 20×= +=
+ )÷ = ÷ = 8
Part2:
1
3
1
3
4
8
脱式计算
4
4
3
4
36×
34×
4
5
5 7
9 10
1
6
1
3
× + =
12
1
4
33
35
13
12
× =
( - )÷1 =
5
6
5 5
6 9
2
3
( + )×3+ ×15
124 12
×
17
12+
17
1 1 3 47 3
124
Part3:解方程
χ÷ + =1
10:(
5
9
χ+1)=:
2
3
: =
5
6
χ:9
(3χ+2)÷4=2χ-7
Part1:口算
+= 30×= += - )÷ = ×3-
= 3
Part2:
5
8
3
1
2 3
1
16
脱式计算
8
9 7
2
35
121
× +
5
37
× 78
5 2
121 37
×
23
11
×
( ×
22
- )
4
77
46
1
3
÷ = ÷ += 4
78
79
26-25×27
26×27-1
4
5
÷ -
÷4=
1
5
4 4
5 5
Part3:解方程
(3χ+5)÷2=(5χ-9)÷3
- =
3χ-2)+3=
+ =
Part1:口算
+=
= ÷= × = 25 ×4= 7
Part2:
5 3 2
9
脱式计算
13 51
3 3
4
× +
4
×
- + - + -
9 1
17 24
5 9
11 24
26×28×( + )
1 1
26×27 27×28
× + ×
+
χ
χ
2
3
21
21
χ
6
×3=
+ = + =
5 2
9 5
7 9
11
3
13
15 17
12 20
30
4
42
56 72
17
25
5 8
17 17
37 25
37 37
2
25
2
9
×
Part3:解方程
χ÷4×8=
- =6
45 45
χ
3χ
5(6-2χ)+4=34+4×(7-3χ)
2χ-3(4χ-9)=2+5×(1+χ)
Part1:口算
= += 70×=
375+279=
1
+
×
2
= ( + - )
3
×12=
2
3
×
1
-
× = ÷
3
14
4
×4=
3 2
5 9
10
3
4
2
5
= 25
9
9
5
5
Part2:脱式计算
12
-(
÷
1
+ ) 3
7
4
5
7
3 15
4
×14-4÷
5
5
9
1 1 3
5
÷
[( + )
6
×
5
×+9 ×3
4 1
18
]
5
9
5
9
4
Part3:解方程
= +1
1 - =1
2
χ-1
χ+2
1
χ-1
3
2 3
2
3
3
5
4
3
χ+1
-
4
χ+2
=1
=2-
3
χ+12
5
χ-7
2 5
Part1:口算
+= = 864÷80=
+=
( + )
3
×
5
32=
÷( + )=
1
10
1
÷
+ =
1
×(15
2 2 1
4 8 2 5
15
×
5
)=
4
Part2:脱式计算
2
5
×
+
2
10
×÷
9
10
5
×
1
10
÷
[ -( + )]
( + )
5
8
÷
4
÷ [1-( +
)
1
1
8
× ]÷
15 15
Part3:解方程
χ- -
=1 - =1
1-
χ
χ+2
3
6
4
- ÷
2
29
=
8 9 1
49 8 8
2
3
1
5
3
χ+12
4
3
29
31
3
7
1
13
7
10
6-
χ
2
7 1 2
9 9
9
1
9
÷
3+χ- χ=12
(χ-3)=2- (χ-3)
Part1:口算
+= 501-446= += 4×592=
(35+ )
5
÷
5= ÷ +
5
9
= -
5 1
×
5
= ( ×
11
= ( - )
11 13
7
÷
12 9
12
13
13
33
÷
Part2:脱式计算
113 +886
3
×
5
+ [ +( -
)]
÷
13
19
10-( +
2 3
2)
5
×
5
×1 ÷
Part3:解方程
=
χ+3
χ
-
-3= -
χ-1
6 2
χ
χ
2
1 1
2 2
3
4
8
13
2
15
1 1
5 6
1 3
2 5
2-χ
χ
2
3
χ
3
3χ+1
6
11
12
4
5
2χ+3
6
χ+1
2
5 1
6 24
=
+1= - -
=1-
Part1:口算
673+= 713-485=
+= = ÷30=
3
× +
2
×
3
= ×101- =
7 1
4 5 4
25
× ×
7
25
50= (
- )
19
100
÷
=
3
8
÷ + × =
3
13
4
24 24
Part2:脱式计算
+
1
÷ ×
3 +
3 5
×2 ÷
1 2
50 20 17
6 3
×2 +÷×
7
4 3
10
(
+
19
÷
2 )
5
2
3
Part3:解方程
=
-4
4(χ-1)
χ+1
χ- = -3
χ-2
2χ-5
9
3
5
2
(3χ+7)=2- χ
3
[χ- (χ-1)]= (χ-1)
1 1
7 2
2
2
2
3
7 11
9 5
2
9
5
11
Part1:口算
= +176= += =
=×
1
2 3 11 7 2
1
2
×4×
= ( - )÷ = - × = 1-
×
72 3
( - )= = 96
16
×
5
21
7
1
1
12
7 4
12 18
Part2:脱式计算
1÷(2
1
×
×(2 ÷ × )
10
(1- )
1 1
4
÷
×10)
20
×+÷1
Part3:解方程
χ=
= +2
4
3
×
[3×(χ- )+ ]=2
1
2
χ
4
3
-1 =
+2
Part1:口算
3
3
4
25 8
7 1 3
10 3
4
1
5
χ
χ+
χ-2
4-3χ
4 6
416-384= ÷60= = 382×8=
7 5 9
3 7 2 4
4
× ××( + )=
36-36
5 3 14
= 16
8
4 8
× = + × =
9
×( -
)=
15
7
8
4
3
5
8
1
4
Part2:脱式计算
(3
3
÷× ÷48
1
+3 )÷2 6
1
×[1-(2 ]
6 × +3 ÷
10
1 1
6
5
9
1
2
4
3
2
3
5
1
9
Part3:解方程
1
(χ-1)=(χ+5)+ χ+
=2-
1
3
3
χ+2
5
χ-1
2
1
(
1
χ
+15)= - (χ-3)
= -1
1
5
2
+2χ
χ
3
Part1:口算
287+363= = ×= +=
×24×25= - × = 24 × = -( -
)= -( - )=
74
3
3
75
Part2:脱式计算
7
8
1
4
5
7
2
7
1
4
1
3
3
5
2
13
1
2
1
2
7
12
3
1
4
2
1
2
3
4
3
8
1 1 1 1 1 1 1
6 12 20 30 42 56
72
×7 +3 ×
+ + + + + + +
100
1 1
54
×[ ÷( - )]
Part3:解方程
5χ+2×(2χ-7)=9-4×(2+χ)
+χ= -
χ-14
-
2χ+1
4
6
=1 =
-2
Part1:口算
=
115-73= += ÷30=
4
5
×( - )=
1 1
4 8
× )=
6 = ×( + )= =
1
8
2
3
Part2:脱式计算
[1-( - )]
2
÷
1
(2 +(1
5
÷ ×
2
12
3
1
4
χ
-2
3(3χ+5)
3 2
1-2χ
3χ+1
3
7
2 5
3 6
1
2
8
3
1-2χ
6
5
8
×+56×1 +(1+× 5 -(3 +
1
4
Part3:解方程
[
1
χ- (χχ- )
+1=
2
3
1
-1)]= (
1
2
3
2
2
(
3
χ=7
- =
Part1:口算
+=
+= = ×40=
12 12 7
×12+ = ( + )
13
÷
8
=
1
5
1
8
3
1
24
÷( +
)= 5×( + )
4
×
3
7= ( +
Part2:脱式计算
2
5
×
(4-
)÷
2
3
(
8
15
÷ ×
1
2
χ+1
3χ-2
3
2
3χ-1
5χ-6
2 5
×13)
1 3
5
÷
=
7
8
2 5
5
5 4
2
2 2
5
5
513
2
×÷ ÷ + ×
9
2
15
7
20
Part3:解方程
χ- =11-
1
χ
- =
2
5 5
4χ+ =
1
2
χ
1
2
+4 -
= -3
Part1:口算
573+672=
= ×50= +=
7 2 7
9
÷
3
÷
= ( +
)
8
÷ =
1
5
5
7
14
×( + )= 1-( - )=
56
14
Part2:脱式计算
5
7
÷
) 2
5
÷ ×
8 8
2 2 5 1
5
7 7 5
3χ
χ-2
5
2 1 1
3 8 4
÷
2
=
1
3
17
27
4χ
χ+3
2χ-5
10 3
1 1
2
2 4 3
1 2
8 27
3 27
8 37
2 ×3 +5 ×+2
15 ×+1 ÷
Part3:解方程
(11-χ)= ×13
= -1
χ- =×
8 1
15
= -1
2
Part1:口算
+= 375÷50= +=
7
9
×9+ = ( + )
7 7
7
7 1 1
9
÷
8
= ( - )
16 16
×
45= 2- ÷
3
= -( - )=
5
Part2:脱式计算
120÷[
-(1- )] +3 +3 +(5
7 7
11 11
1
6
÷
[1÷( - )]
(
3 3
5 10
÷ ×÷1
2χ-1
χ+2
3
4
χ
χ
6 9
13 26
11 1 1 6
12 7 12 7
8
8
15
9
3
1
5
2
3
8
1
4
Part3:解方程
7 -3χ-1)
1
×(χ+ )=4 -2+
=3(
1
3χ-1
2χ+4
3 9
13
20
χ
-(18- χ)=26
-2= -
13
20
Part1:口算
+= 767+438=
621-463= ×=
5-( ÷
6 3
1
÷ = 1-7
1 1
7
)=
25
14
÷ = ( + )
4
5
÷
9=
12
Part2:脱式计算
1+ +( )
1
2
1
+( )
3
+…
1
+( )
100
1
× )+ ÷
2 2
2 2
(1+ + + )
1
1 1
( + +
+ )-(1+ + + + )
1
2
1 1 1
3 4 5
1
1 1
2
3
×
4
×( + + )
2
3 4
3
3χ+1
2
÷
1
60
9+
× =
3
4
1
1
5
2
1
3
2
3χ-2
10
1
4
1
4
2χ+3
3
5
5
12
2
1
5 9
5
Part3:解方程
1-2(χ- )=
- =0
1 1
2χ+5
χ+4
6 3 5 3
1- (
1 2 1 1
χ-5
3
2
χ
3
+ )=
=
2 4
χ+5
4
Part1:口算
÷= += =
÷ × = 2- ÷ = ÷(2÷ )= + ×
= 2× + ÷2=
1
4
13
7 3
2
3 5
5
Part2:
5
5
脱式计算
4
5
8
16 8
3 8 8
4
15
41 × +51
3
×
4
×39+ ×27
3
4 5 4
1 1 1
3 4 4
1 5 7
17
×
+ ×
17
[ -( - )]
×
1 5
1
6 14
3
9
4 1
9 9
Part3:解方程
4×(χ-2)+20χ-4=5(1-2χ)
= χ-(χ-1)
2(2χ-01)
3
3
2
2 2
5 5
2-3χ
4×2+(χ-2)×2÷4=6+4×(χ-1)-12
- = -2
2 3
5+χ
χ
4
Part1:口算
+=
= 3×463= 48÷120= +=
16
×3÷
4
=
5
÷8+
5
12
× =
1 7
8
÷
12
= 12
×+ )= 1-(
+ )=
Part2:脱式计算
5
×
[1÷(
+ )] 16-(9 +
3
8
4
1
÷ )
3
(3 -2
2
2 1
5
×
3
)
÷
3
4
4
( -
5
÷2)×
Part3:解方程
2×(2χ-1)-4×(4χ-1)-5×(2χ+1)=19
8
15
χ- =
+2
2
3
1
1
4
10
5
6
1
1
3
12
10
13
2-18χ
6
4 2
15 5
χ
9
5
(χ+1)×+(100-χ)×= χ
= -
2
5
Part1:口算
= += ×40= 347+=
7
- ×
2
= 2-
5
÷ - = 20
3
7
÷
1
÷
= ( - )÷ =
42
5
4
1 1 4
9
3 6 8
16
7 9
7
÷( ÷ )=
5
6 5
Part2:脱式计算
2
1
×
(10-3
)÷
1
4
4
÷16+3 ×
4 1 2
25 3 5 7 2 7
15-3
8 3 1 2 2 1
9
÷
×
8
2
2 -
7
×2+1
9 9 2
Part3:解方程
7χ-12×( χ
5
-
)=8-
1
×(6χ
2
-9)
-1= -
3 2 3
3χ+2
2χ-1
2 4
1
1
3-4χ
1
2
2
2
3
2 4
2-χ
3
6 3
5 7
2χ+1
5
χ-
[χ- (χ-1)]= (χ-1) 5-
= χ+1
Part1:口算
+=
640-582= 2×863=
3
7
+
3
7
÷
3= ( -
)÷
1
= 6
3
2
8
×(
3
4
÷ )= 1÷( ÷
1
5
)= 96
3
10
×(
Part2:脱式计算
1÷ +
2
11
×
11
9
(3
÷2 ) (2-3
1 34
5 55
× )÷(4 ÷3 )
1
7 3 1
18
÷
(1
×
4
+
4
÷
1 )
4
15
1
7
5
×[( + )÷6]
Part3:解方程
｛
1
[ (
1
χ
1
-1)+3]+5
1
｝=1
- =1
6 4 3 2
[ - ( -1)]=
[ (
1 1
2
χ
2
3χ
χ
χ+1)+2]- = χ
3
2 12
)=
1 1 1
4 5 16
1 5 8
2
5 16 15 5
5
6
2
3
χ
3 2 3
2
2 1
3 2
3 2
3
7
÷
Part1:口算
= = 736×7=
237+688=
6 1
1
1
5 3 1
4
3
×( + )= ÷ + = ( - )÷ =
( + )×30= 12
19
6 4
3
4
2
× =
2
5 8
2 1
5 10
5
6
Part2:脱式计算
7
+
1
× [2-(1
1 ]
3 2
10
÷
5 8 3
3 +
5
×
3
(1 -
)
÷
7
2
[9-( + )
1
5
24
8
9
2
9
Part3:解方程
(2
7
χ-1)+ (1-2
1
χ)= (2χ-1)
3
2
2
2
3
[ (2
3
2
χ
2
3
-1)-2]-χ=2
- =1-
Part1:口算
×6
×24]÷1
χ+ =3-
2 5 3
3 12 8
1
13
12
8 5
χ-1
2χ-1
2
3
(χ-3)
χ-1
2
916-438= ÷7= 568+349=
+794=
1 4 1 3 3 1 3
÷ + = ( -
)×100= 1-( + )= (15+ )× = -
× =
3 9 2 4 25 4 8
5
7
2
15
2
9
7
16
2
9
Part2:脱式计算
4
1
÷×3
1 2 +1÷ -1 ×1 +3
2
5
1
9
2
9
2
5
4
7
7
20
)÷(2 +
4
15
×
7 (1
1
3
Part3:解方程
[ (
3
χ- )-8]=
1
4
4
1
χ
+1 =
3
3
2
4 2
( χ× -5)-
2 1
5
5
χ=3
- =
6
6
Part1:口算
= +567= = ÷20=
189+482=
21 5 1 1
9 2 4
+5 ÷
)÷11
8 13 8
13 42
5
7
21
2(2χ-3)
χ
χ+
χ
1 1 8 1 2
6
5 3 9 3 3
5
5
8
+χ
2 3
5 10
×
5
÷7× = 3÷ - =
( + )÷ = + × = 25× × =
Part2:脱式计算
[1-(4 ×
1
2)]÷
×+×
3
×
×1 ÷1
3
13
2
× + ÷
1
1 5
3
12
3 12
Part3:解方程
( χ
3
5
+6) -
χ
5
=21
- =
1
χ+
χ
3
2
[2
3 1
3χ-1
3χ+5
χ-4
2
×(χ+
)]+2]=5
2
χ +1=
- -2
3
4
6
Part1:口算
+= ×9=
= =
26
×
4
13
×
= 1-
1
4
× =
2
3
×
3
5
÷
= 1- - =
1 1 1
1 5
4 6
÷ + =
7
4
8
Part2:脱式计算
1
5
2 1 1
201 201
34
3 5 13
209 209
195
+χ
1
2
1 1
4 2
9
÷[( + )× ]
11 ÷ × ×
2
2
÷
+ )+ ×
+35
1
5
2
5 3
× )÷
Part3:解方程
2[(χ+5)-2(χ+1)]=5
3χ- =15- -
χ- [
1
χ
- (χ
1
- )]=2
{ [ ( +4)+6]+8}=1
1 1
2 2 2
9
Part1:口算
383+394=
+= 471-453= ÷3=
12 1 3
1 1 3
× - = ( - )
4 5
×
=
2 4
÷
÷
4
=
3
÷( - )= +
5 2 5
6 3 6
×2=
Part2:脱式计算
3
÷
12÷
(
5
×8÷
3
8 16
×
8
3
14
2(χ+3)
3
1 1
χ+2
7 5 3
3 3
4 8
5
6
15
14
χ+2
2
2
5
5
2
χ-2
6
3
5
5
299÷(299+ )
2-(6 ÷3
300
299 5
12
Part3:解方程
1-2(χ- )=
- =0
1
6
1
3
1- (
1 1 1 1
2
χ
3
+
)= -
=
2 4
Part1:口算
+= =
×= +67=
3
8
×15÷ =
5
9 5
16
÷12- = ( + )
12
÷ = ( + )
Part2:脱式计算
[2 +
)
7
×]÷1
×
7
1 +3
10
2
3
15
2 2 1
7
×
3
12=
7
2χ+5
5
χ+4
3
χ-3
χ+4
÷ =
1
5
9 6
3
7
1
8
8
2 8
9
5
15
×
3 -
2
×
1
[3
÷× )]×
4 14
13 4 5 25
Part3:解方程
3
χ
-1 =1-χ
χ- (1- )=
2
3-χ
2-3χ
4
3
3 6
4
χ
-(465-χ)× =20
- = +3
2
4χ
5χ
χ
5
3
Part1:口算
249+367=
637×6= ÷= = +=
1
2 2
1
1 2 4
5
+
9
÷
= 1-( - )=
18-18
5
9
3
2
× = ÷
× = 1-( + )=
1
6
5 5 5
Part2:脱式计算
1
÷
[( +
)
2
×
1
]
(
1
× + )÷(11- )
21 13
5 3
5 13 13 42
2 5
3 3
7
9
5
1 5
2 1
8
4
8
11 5
1
6
3 1
8 4
÷[( - )×12]
÷[[ ×( + )]
Part3:解方程
1 - =(1 - )
1
χ
×
1
- =1-
χ
3 40 3 50
4(χ-2)+20χ-4=5(1-2χ)
χ- = -1
χ
2
2χ+4
5χ+12
3
6
1-χ
χ+2
3 6