题目内容
计算下面各题,能简算的要简算.
(1)(
+
+
)÷
(2)137×
(3)(
-
)×36.
(1)(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 24 |
(2)137×
| 9 |
| 136 |
(3)(
| 11 |
| 12 |
| 1 |
| 4 |
考点:分数的简便计算
专题:运算定律及简算
分析:利用乘法分配律简算各题即可.
解答:
解:(1)(
+
+
)÷
=(
+
+
)×24
=
×24+
×24+
×24
=8+6+4
=18;
(2)137×
=(136+1)×
=136×
+1×
=9+
=9
;
(3)(
-
)×36
=
×36-
×36
=33-9
=24.
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 24 |
=(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
=8+6+4
=18;
(2)137×
| 9 |
| 136 |
=(136+1)×
| 9 |
| 136 |
=136×
| 9 |
| 136 |
| 9 |
| 136 |
=9+
| 9 |
| 136 |
=9
| 9 |
| 136 |
(3)(
| 11 |
| 12 |
| 1 |
| 4 |
=
| 11 |
| 12 |
| 1 |
| 4 |
=33-9
=24.
点评:掌握乘法分配律简算是解决问题的关键.
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