题目内容
(1)计算:|
-4|-22+
;
(2)化简,求值:
÷
,其中x=
-1.
| 3 |
| 12 |
(2)化简,求值:
| x-1 |
| x2-2x+1 |
| 1 |
| x2-1 |
| 2 |
(1)原式=4-
-4+2
=
;
(2)原式=
•
=
(x-1)(x+1)
=x+1,
当x=
-1时,原式=
.
| 3 |
| 3 |
| 3 |
(2)原式=
| x-1 |
| x2-2x+1 |
| x2-1 |
| 1 |
=
| x-1 |
| (x-1)2 |
=x+1,
当x=
| 2 |
| 2 |
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