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.
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