题目内容
(1)计算:
+(
)-1-(
+1)0;
(3)计算:
-
.
| 12 |
| 1 |
| 4 |
| 2 |
(3)计算:
| 2a |
| a2-9 |
| 1 |
| a-3 |
(1)原式=2
+4-1=2
+3;
(2)原式=
-
=
-
=
=
.
| 3 |
| 3 |
(2)原式=
| 2a |
| (a+3)(a-3) |
| 1 |
| a-3 |
=
| 2a |
| (a+3)(a-3) |
| a+3 |
| (a+3)(a-3) |
=
| a-3 |
| (a+3)(a-3) |
=
| 1 |
| a+3 |
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