五年级解方程50题答案
-
五年级解方程
50
题
答案
(
1
)
(0.5+x)+x=9.8
÷
2
0.5+2x=4.9
0.5+2x-0.5=4.9-0.5
2x=4.4
2x
÷
2=4.4
÷
2
X=2.2
(
2
)
< br>2(X+X+0.5)=9.8
2x+2x+1=9.8
4x+1-1=9.8-1
4x=8.8
4x
÷
4=8.8
÷
4
X=2.2
(
3
)
25000+x=6x
25000+x-x=6x-x
5x=25000
5x
÷
5=
25000
÷
5
X=5000
(
4
)
3200=440+5X+X
6x+440=3200
6x+450-450=3200-440
6x=2760
6x
÷
6=2
760
÷
6
X=460
(
5
)
X-0.8X=6
0.2x=6
0.2x
÷
0.2=6
÷
0.2
X=30
(6)12x-8x=4.8
4x=4.8
4x
÷
4=4.8
÷
4
X=1.2
(7) 7.5+2X=15
2x+7.5-7.5=15-7.5
2x=7.5
2x
÷
2=
7.5
÷
2
X=3.75
(8) 1.2x=81.6
1.2x
< br>÷
1.2=81.6
÷
1.2
X=68
(9)
x+5.6=9.4
X+5.6-5.6=9.4-5.6
X=3.8
(10)x-0.7x=3.6
0.3x=3.6
0.3x
÷
0.
3=3.6
÷
0.3
X=12
(11)91
÷
x
=
1.3
91<
/p>
÷
x
×
x=1.
3
×
x
1.3x=91
1.3x
÷
1.3=91
÷
1.3
X=70
(12) X+8.3=10.7
X+8.3-8.3=10.7-8.3
X=2.4
(13) 15x
=
3
15x
÷
15=3
p>
÷
15
X=0.2
(14) 3x
-
p>
8
=
16
3x-8+8=16+8
3x=24
3x<
/p>
÷
3=24
÷
3
X=8
(15) 3x+9=27
3x+9-9=27-9
3x=18
3x
÷
3=18
÷
3
3x=6
(16) 18(x-2)=270
18x-36=270
18x-36+36=270+36
18x=306
18x<
/p>
÷
18=306
÷
18
X=17
(17)
12x=300-4x
12x+4x=300-4x+4x
16x=300
16x
÷
16=300
÷
16
X=18.75
(18)
7x+5.3=7.4
7x+5.3-5.3=7.4-5.3
7x=2.1
7x
÷
7=2.1
÷
< br>7
X=0.3
(19)
3x
÷
5=4.8
3x<
/p>
÷
5
×
5=4.
8
×
5
3x=24
3x
÷
3
=24
÷
3
X=8
(20) 30
÷
x+25=85
30
÷
x+25-25=85-25
30
÷
x=60
30<
/p>
÷
x
×
x=60
×
x
30=60x
60x
÷
60=30
÷
60
X=0.5
(21)
1.4
×
8-2x=6
11.2-2x+2x=6+2x
11.2=6+2x
2x+6-6=11.2-6
2x=5.2
2x
÷
2=5.2
÷
2
X=2.6
(22)
6x-12.8
×
3=0.06
6x-38.4=0.06
6x=38.46
6x
÷<
/p>
6=38.46
÷
6
X=6.41
(23) 410-3x=170
410-3x+3x=170+3x
170+3x=410
3x+170-170=410-170
3x=240
3x
÷
3=240
÷
3
X=80
(24) 3(x+0.5)=21
3x+1.5=21
3x+1.5-1.5=21-1.5
3x=19.5
3x
÷
3=19.5
÷
3
X=6.5
(25)
0.5x+8=43
0.5x+8-8=43-8
0.5x=35
0
.5x
÷
0.5=35
÷
0.5
X=70
第
1
页
共
2
页