题目内容
| 3 |
| 5 |
| 7 |
| 2 |
分析:
与
的积是
×
=
,然后求出倒数即可.
| 3 |
| 5 |
| 7 |
| 2 |
| 3 |
| 5 |
| 7 |
| 2 |
| 21 |
| 10 |
解答:解:1÷(
×
),
=1÷
,
=
;
答:
与
的积的倒数是
.
| 3 |
| 5 |
| 7 |
| 2 |
=1÷
| 21 |
| 10 |
=
| 10 |
| 21 |
答:
| 3 |
| 5 |
| 7 |
| 2 |
| 10 |
| 21 |
点评:先求出积,再求倒数.理解倒数的概念,是解答的关键.
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