题目内容
| 能简算的要简算. (
|
|
15÷
|
分析:(1)运用乘法分配律简算;
(2)(3)把除法改为乘法,约分计算.
(2)(3)把除法改为乘法,约分计算.
解答:解:(1)(
+
)×140,
=
×140+
×140,
=80+294,
=374;
(2)
÷
÷
,
=
×
×
,
=
;
(3)15÷
×
,
=15×
×
,
=10.
| 4 |
| 7 |
| 21 |
| 10 |
=
| 4 |
| 7 |
| 21 |
| 10 |
=80+294,
=374;
(2)
| 5 |
| 8 |
| 7 |
| 12 |
| 7 |
| 10 |
=
| 5 |
| 8 |
| 12 |
| 7 |
| 10 |
| 7 |
=
| 75 |
| 49 |
(3)15÷
| 9 |
| 10 |
| 3 |
| 5 |
=15×
| 10 |
| 9 |
| 3 |
| 5 |
=10.
点评:完成本题,要注意分析式中数据,运用合适的简便方法计算.
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