题目内容
下面各题,怎样算简便就怎样算.
(2-
+
)×12
45÷
+15÷
(68-
)×
.
(2-
| 1 |
| 12 |
| 1 |
| 8 |
45÷
| 3 |
| 5 |
| 3 |
| 5 |
(68-
| 17 |
| 18 |
| 1 |
| 17 |
分析:(1)根据乘法分配律进行简算;
(2)先把乘法变成除法,再根据乘法分配律进行简算;
(3)根据乘法分配律进行简算.
(2)先把乘法变成除法,再根据乘法分配律进行简算;
(3)根据乘法分配律进行简算.
解答:解:
(1)(2-
+
)×12,
=2×12-
×12+
×12,
=24-1+1.5,
=23+1.5,
=24.5;
(2)45÷
+15÷
,
=45×
+15×
,
=(45+15)×
,
=60×
,
=100;
(3)(68-
)×
,
=68×
-
×
,
=4-
,
=3
.
(1)(2-
| 1 |
| 12 |
| 1 |
| 8 |
=2×12-
| 1 |
| 12 |
| 1 |
| 8 |
=24-1+1.5,
=23+1.5,
=24.5;
(2)45÷
| 3 |
| 5 |
| 3 |
| 5 |
=45×
| 5 |
| 3 |
| 5 |
| 3 |
=(45+15)×
| 5 |
| 3 |
=60×
| 5 |
| 3 |
=100;
(3)(68-
| 17 |
| 18 |
| 1 |
| 17 |
=68×
| 1 |
| 17 |
| 17 |
| 18 |
| 1 |
| 17 |
=4-
| 1 |
| 18 |
=3
| 17 |
| 18 |
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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