题目内容
计算:
(1)x-
+3;
(2)(
-
)÷
.
(1)x-
| x2 |
| x+3 |
(2)(
| x |
| x-2 |
| x |
| x+2 |
| 4x |
| 2-x |
(1)原式=
=
;
(2)原式=
×
=-
.
故答案为
、-
.
| x2+3x-x2+3x+9 |
| x+3 |
| 6x+9 |
| x+3 |
(2)原式=
| x2+2x-x2+4 |
| (x-2)(x+2) |
| 2-x |
| 4x |
| 1 |
| x+2 |
故答案为
| 6x+9 |
| x+3 |
| 1 |
| x+2 |
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