题目内容
| 7 | 15 |
分析:把29改写成30-1,进而运用乘法分配律计算得解.
解答:解:
×29,
=
×(30-1),
=
×30-
,
=14-
,
=13
.
| 7 |
| 15 |
=
| 7 |
| 15 |
=
| 7 |
| 15 |
| 7 |
| 15 |
=14-
| 7 |
| 15 |
=13
| 8 |
| 15 |
点评:关键是把29改写成30-1,从而利用乘法分配律巧算得解.
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