题目内容
计算:
(1)
-
(2)
+
(1)
| a2 |
| a-b |
| b2 |
| a-b |
| 12 |
| m2-9 |
| 2 |
| 3-m |
(1)原式=
=
=a+b;
(2)原式=
-
=
=
=-
.
故答案为a+b、-
.
| a2-b2 |
| a-b |
| (a+b)(a-b) |
| a-b |
(2)原式=
| 12 |
| (m+3)(m-3) |
| 2 |
| m-3 |
=
| 12-2(m+3) |
| (m+3)(m-3) |
=
| -2(m-3) |
| (m+3)(m-3) |
=-
| 2 |
| m+3 |
故答案为a+b、-
| 2 |
| m+3 |
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