题目内容
填空.
(1)
-
=______.
(2)
-
=______.
(1)
| x+2 |
| x+1 |
| x-1 |
| x+1 |
(2)
| ||
| x-3 |
| 9 |
| x-3 |
(1)
-
=
=
;
(2)
-
=
=x+3;
故答案为;
,x+3.
| x+2 |
| x+1 |
| x-1 |
| x+1 |
| x+2-x+1 |
| x+1 |
| 3 |
| x+1 |
(2)
| ||
| x-3 |
| 9 |
| x-3 |
| (x+3)(x-3) |
| x-3 |
故答案为;
| 3 |
| x+1 |
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