题目内容
计算.
(1)
-a-1
(2)
-
•
.
(1)
| a2 |
| a-1 |
(2)
| x |
| x-1 |
| x+3 |
| x2-1 |
| x2+2y+1 |
| x+3 |
(1)原式=
=
=
;
(2)原式=
-
•
=
-
=
.
| a2-(a+1)(a-1) |
| a-1 |
| a2-a2+1 |
| a-1 |
| 1 |
| a-1 |
(2)原式=
| x |
| x-1 |
| x+3 |
| (x+1)(x-1) |
| (x+1)2 |
| x+3 |
| x |
| x-1 |
| x+1 |
| x-1 |
| 1 |
| 1-x |
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