题目内容
已知a和b互为倒数,写出下列各式的结果.
×
×
.
| a |
| 9 |
| b |
| 8 |
| 5 |
| a |
| 4 |
| b |
a和b互为倒数,可知ab=1,那么:
(1)
×
=
=
;
(2)
×
=
=20.
(1)
| a |
| 9 |
| b |
| 8 |
| ab |
| 9×8 |
| 1 |
| 72 |
(2)
| 5 |
| a |
| 4 |
| b |
| 5×4 |
| ab |
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题目内容
| a |
| 9 |
| b |
| 8 |
| 5 |
| a |
| 4 |
| b |
| a |
| 9 |
| b |
| 8 |
| ab |
| 9×8 |
| 1 |
| 72 |
| 5 |
| a |
| 4 |
| b |
| 5×4 |
| ab |