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