题目内容
计算:
(1)
+
;
(2)
+
-
.
(1)
| 12 |
| m2-9 |
| 2 |
| 3-m |
(2)
| 3 |
| x+2 |
| 1 |
| 2-x |
| 2x |
| 4-x2 |
(1)原式=
-
=
=
=
;
(2)原式=
-
+
=
=
=
.
| 12 |
| (m+3)(m-3) |
| 1 |
| m-3 |
=
| 12-m-3 |
| (m+3)(m-3) |
=
| 9-m |
| (m+3)(m-3) |
=
| 9-m |
| m2-9 |
(2)原式=
| 3(x-2) |
| (x+2)(x-2) |
| x+2 |
| (x+2)(x-2) |
| 2x |
| (x+2)(x-2) |
=
| 3x-6-x-2+2x |
| (x+2)(x-2) |
=
| 4(x-2) |
| (x+2)(x-2) |
=
| 4 |
| x+2 |
练习册系列答案
相关题目