题目内容
脱式计算(能简算的要简算)
24×(
+
-
)
×37%+
×37%
2.7×
×
(
+
)÷
.
24×(
7 |
8 |
3 |
2 |
3 |
4 |
1 |
5 |
4 |
5 |
2.7×
5 |
9 |
6 |
5 |
(
7 |
10 |
5 |
6 |
1 |
30 |
考点:分数的简便计算,分数的四则混合运算,百分数的加减乘除运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)运用乘法分配律简算.
(3)从左往右依次运算.
(4)把除法变为乘法,运用乘法分配律简算.
(3)从左往右依次运算.
(4)把除法变为乘法,运用乘法分配律简算.
解答:
解:(1)24×(
+
-
)
=24×
+24×
-24×
=21+36-18
=39
(2)
×37%+
×37%
=
×0.37+
×0.37
=(
+
)×0.37
=1×0.37
=0.37
(3)2.7×
×
=1.5×
=1.8
(4)(
+
)÷
=(
+
)×30
=
×30+
×30
=21+25
=46
7 |
8 |
3 |
2 |
3 |
4 |
=24×
7 |
8 |
3 |
2 |
3 |
4 |
=21+36-18
=39
(2)
1 |
5 |
4 |
5 |
=
1 |
5 |
4 |
5 |
=(
1 |
5 |
4 |
5 |
=1×0.37
=0.37
(3)2.7×
5 |
9 |
6 |
5 |
=1.5×
6 |
5 |
=1.8
(4)(
7 |
10 |
5 |
6 |
1 |
30 |
=(
7 |
10 |
5 |
6 |
=
7 |
10 |
5 |
6 |
=21+25
=46
点评:此题主要考查应用运算定律对分数的四则混合题目进行简便计算.
练习册系列答案
相关题目