题目内容
计算下面各题能简算的要间算.
36×(
+
-
);
÷9+
×
.
36×(
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
| 9 |
| 16 |
| 1 |
| 9 |
| 7 |
| 16 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用乘法的分配律进行简算;
(2)把除以9化成乘以
,再运用乘法的分配律进行简算.
(2)把除以9化成乘以
| 1 |
| 9 |
解答:
解:(1)36×(
+
-
)
=36×
+36×
-36×
=24+6-27
=30-27
=3;
(2)
÷9+
×
=
×
+
×
=(
+
)×
=1×
=
.
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=36×
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=24+6-27
=30-27
=3;
(2)
| 9 |
| 16 |
| 1 |
| 9 |
| 7 |
| 16 |
=
| 9 |
| 16 |
| 1 |
| 9 |
| 1 |
| 9 |
| 7 |
| 16 |
=(
| 9 |
| 16 |
| 7 |
| 16 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
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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