数学五年级上册简便计算练习(答案)
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2021年01月30日 02:52
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1
小学数学五年级上册简便计算练习(答案卷)
一、归类练习:
3.29
+
0.73
+
2.27
3.29
-
0.73
-
2.27
7.5
+
2.5
-
7.5
+
2.5
=3.29
+(
0.73
+
2.27
)
=3.29
-(
0.73
+
2.27
)
=
(
7.5
-
7.5
) +
(
2.5
+
2.5
)
=3.29
+
3
=3.29
-
3
=0
+
5
=6.29 =0.29 =5
(加法结合律)
(减法的性质)
(同级运算交换)
7.325
-
3.29
-
3.325
7.325
-
(5.325
+
1.7)
7.325
-
(5.325
-
1.7)
=7.325
-
3.325
-
3.29
=7.325
-
5.325
-
1.7
=7.325
-
5.325
+
1.7
=4
-
3.29
=2
-
1.7
=2
+
1.7
=0.71 =0.3 =3.7
(减法交换)
(减法的性质)
(前面减号,脱括号变符号)
3.29
+
0.73
-
2.29
+
2.27
3.29
×
0.25
×
4
0.125
×
8.8
=
(
3.29
-
2.29
)+(
0.73
+
2.27
)
=3.29
×(
0.25
×
4
)
=0.125
×
8
×
1.1
=1
+
3
=3.29
×
1
=1
×
1.1
=4 =3.29 =1.1
(同级运算交换)
(乘法结合律)
(先拆数,乘法结合律)
0.25
×
0.28
0.125
×
3.2
×
2.5
35
×
10.2
=0.25
×
4
×
0.07
=(
0.125
×
8
)×(
0.4
×
2.5)
=35
×(
10
+
0.2
)
=1
×
0.07
=1
×
1
=35
×
10
+
35
×
0.2
=0.07 =1 =350
+
7
(先拆数,乘法结合律)
(拆数,乘法结合律)
=357
(拆数,乘法分配律)
0.25
×
4
÷
0.25
×
4
3.5
×
9.9
3.5
×
99
+
3.5
=
(
0.25
÷
0.25
)×(
4
×
4
)
=3.5
×(
10
-
0.1
)
=3.5
×
(
99
+
1
)
=1
×
16 =3.5
×
10
-
3.5
×
0.1 =3.5
×
100
=16 =35
-
0.35 =350
(同级运算交换)
=34.65
(乘法分配律)
2
(拆数,乘法分配律)
3.5
×
101
-
3.5
3.5
×
9.9
+
3.5
×
0.1
★
3.5
×
2.7
+
35
×
0.73
=3.5
×(
101
-
1
)
=3.5
×(
9.9
+
0.1
)
=3.5
×
2.7
+
3.5
×
7.3
=3.5
×
100 =3.5
×
10 =3.5
×(
2.7
+
7.3
)
=350 =35 =3.5
×
10
(乘法分配律)
(乘法分配律)
=35
(先利用积不变的规律转化,
3.5
×
2.7
-
3.5
×
0.7
0.5
÷
0.6
=3.5
×
(
2.7
-
0.7
)
=3.5
×
2 =40
=7 =47 =5
(乘法分配律)
4.9
÷
1.4
4
=4.9
÷(
7
×
0.2
)
=4.9
÷
7
÷
0.2 =7
=0.7
÷
0.2 =7
=3.5
(拆数,除法的性质)
7.35
÷
(7.35
×
0.25)
=7.35
÷
7.35
÷
0.25
=7.35
=1
÷
0.25 =1
=4 =0.25
(除法的性质)
二、混合练习:
3.07
-
0.38
-
1.62
2.45
-
1.55
=3.07
-
(
0.38
+
1.62
)
=3.07
-
2 =4
=1.07 =14 =4
(减法的性质)
3.25
+
1.79
-
0.59
+
1.75
403
然后再用乘法分配律)
★
(32
+
5.6)
÷
0.8
★
3.5
÷
0.6
-
=32
÷
0.8
+
5.6
÷
0.8
=(3.5
-
0.5)
÷
0.6
+
7 =3
÷
0.6
(后< br>2
题类似分配律,但只适用于(
a
+
b
)÷
c 和
(a
-
b)
÷
c
,而
a
÷
(b
+
c)
和
a
÷
(b
-
c)
不 能用。)
7
÷
0.25
÷
★
7
÷
0.125
=7
÷(
0.25
×
4
)
=7
×
8
÷
1 =56
(乘除法转化规律,转化时
符号相反,转化前后的
2
数
(除法的性质)
相乘得
1
。)
★
7.35
÷
(7.35
÷
0.25)
÷
7.35
×
0.25
×
0.25
(前面是除号,脱括号符号相反)
1.29
+
3.7
+
2.71
+
6.3
8
-
=
(
1.29
+
2.71
)
+
(
3.7
+
6.3
)
=8
-
(
2.45
+
1.55
)
+
10 =8
-
4
(加法交换律和加法结合律)
(减法的性质)
23.4
-
0.8
-
13.4
-
7.2
0.32
×