题目内容
(
+
)×
+
.
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
考点:分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(
+
)×
+
,首先运用乘法分配律,再运用加法结合律简算.
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
解答:
解:(
+
)×
+
=
×
+
×
+
=
+(
+
)
=
+1
=1
.
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 24 |
| 19 |
| 1 |
| 8 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 3 |
| 19 |
| 2 |
| 17 |
| 15 |
| 17 |
=
| 3 |
| 19 |
=1
| 3 |
| 19 |
点评:此题考查的目的是理解掌握乘法分配律的意义、加法结合律的意义,把能够灵活运用这些运算定律进行简便计算.
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