题目内容
计算.
(1)
÷(x+3)•
;
(2)
-
÷
.
(1)
| 2x-6 |
| x2-4x+4 |
| x2+6x+9 |
| 3-x |
(2)
| 2 |
| a+1 |
| a-2 |
| a2-1 |
| a2-2a |
| a2-2a+1 |
(1)原式=
•
•
=-
;
(2)原式=
-
•
=
-
=
.
| 2(x-3) |
| (x-2)2 |
| 1 |
| x+3 |
| (x+3)2 |
| 3-x |
=-
| 2(x+3) |
| (x-2)2 |
(2)原式=
| 2 |
| a+1 |
| a-2 |
| (a-1)(a+1) |
| (a-1)2 |
| a(a-2) |
=
| 2 |
| a+1 |
| a-1 |
| a+1 |
=
| 3-a |
| a+1 |
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