题目内容
开放练习:你能在□中填上合适的数,使计算变得简单吗?
(1)
×
+
×□;
(2)(
+□)×□
(1)
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 7 |
(2)(
| 1 |
| 7 |
考点:分数的简便计算
专题:运算定律及简算
分析:根据乘法分配律解答即可,a(b+c)=ab+ac.
解答:
解:(1)
×
+
×
=
×(
+
)
=
;
(2)(
+
)×14
=
×14+
×14
=2+7
=9
故答案为:
、
、14.
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 7 |
| 5 |
| 8 |
=
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 7 |
(2)(
| 1 |
| 7 |
| 1 |
| 2 |
=
| 1 |
| 7 |
| 1 |
| 2 |
=2+7
=9
故答案为:
| 5 |
| 8 |
| 1 |
| 2 |
点评:此考查了对于乘法分配律的掌握与运用.
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