题目内容
| 3 |
| 7 |
| 1 |
| 5 |
| 4 |
| 7 |
分析:首先把除以5,改写成乘
,然后运用乘法分配律的逆运算进行简算.
| 1 |
| 5 |
解答:解:
÷5+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 3 |
| 7 |
| 1 |
| 5 |
| 4 |
| 7 |
=
| 3 |
| 7 |
| 1 |
| 5 |
| 1 |
| 5 |
| 4 |
| 7 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 1 |
| 5 |
=1×
| 1 |
| 5 |
=
| 1 |
| 5 |
点评:此题考查学生灵活运用运算定律简算的能力.
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