题目内容
(1)化简
•
(2)已知x=-3,求(1-
)÷
的值.
| x |
| x2-1 |
| x2+x |
| x2 |
(2)已知x=-3,求(1-
| 1 |
| x |
| x2-2x+1 |
| x |
(1)原式=
•
=
;
(2)原式=
•
=
,
当x=-3时,原式=
=-
.
| x |
| (x+1)(x-1) |
| x(x+1) |
| x2 |
=
| 1 |
| x-1 |
(2)原式=
| x-1 |
| x |
| x |
| (x-1)2 |
=
| 1 |
| x-1 |
当x=-3时,原式=
| 1 |
| -3-1 |
| 1 |
| 4 |
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