题目内容
化简:
(1)
÷9x2y
(2)
÷(a+2-
),其中a=-
.
(1)
| 12xy |
| 5 |
(2)
| 3-a |
| 2a-4 |
| 5 |
| a-2 |
| 1 |
| 2 |
(1)原式=
•
=
;
(2)原式=-
÷
=-
•
=-
,
当a=-
时,原式=-
=-
.
| 12xy |
| 5 |
| 1 |
| 9x2y |
| 4 |
| 15x |
(2)原式=-
| a-3 |
| 2(a-2) |
| a2-4-5 |
| a-2 |
| a-3 |
| 2(a-2) |
| a-2 |
| (a+3)(a-3) |
| 1 |
| 2(a+3) |
当a=-
| 1 |
| 2 |
| 1 | ||
2(-
|
| 1 |
| 5 |
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