题目内容
下面各题怎样简便就怎样计算.
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72×
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(
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考点:分数的简便计算
专题:运算定律及简算
分析:(1)(2)(3)按照从左到右的顺序计算;
(4)运用乘法分配律简算.
(4)运用乘法分配律简算.
解答:
解:(1)
×
÷
=
×17
=2;
(2)
×
×
=
×
=
;
(3)72×
×
=45×
=15;
(4)(
+
)×24
=
×24+
×24
=12+8
=20.
| 14 |
| 17 |
| 1 |
| 7 |
| 1 |
| 17 |
=
| 2 |
| 17 |
=2;
(2)
| 10 |
| 13 |
| 26 |
| 35 |
| 1 |
| 5 |
=
| 4 |
| 7 |
| 1 |
| 5 |
=
| 4 |
| 35 |
(3)72×
| 5 |
| 8 |
| 1 |
| 3 |
=45×
| 1 |
| 3 |
=15;
(4)(
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 3 |
=12+8
=20.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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