题目内容
计算:(1)
•
÷
;(2)(
-
)÷
.
| 2x2 |
| 3y2 |
| 5y |
| 7x |
| 10y |
| 21x2 |
| x-1 |
| x+1 |
| x+1 |
| x+2 |
| x+3 |
| x2+4x+4 |
(1)原式=
•
•
=
;
(2)原式=
•
=-
.
| 2x2 |
| 3y2 |
| 5y |
| 7x |
| 21x2 |
| 10y |
| x3 |
| y2 |
(2)原式=
| x2+x-2-x2-2x-1 |
| (x+1)(x+2) |
| (x+2)2 |
| x+3 |
| x+2 |
| x+1 |
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