题目内容
(1)化简:
+
;
(2)计算:2-1-tan60°+(
-1)0+
.
| 4a |
| a2-1 |
| 1+a |
| 1-a |
(2)计算:2-1-tan60°+(
| 5 |
| 3 |
(1)
+
=
=-
;
(2)2-1-tan60°+(
-1)0+
=
-
+1+
=
.
| 4a |
| a2-1 |
| 1+a |
| 1-a |
=
| 4a-a2-2a-1 |
| (a+1)(a-1) |
=-
| 1-a |
| 1+a |
(2)2-1-tan60°+(
| 5 |
| 3 |
=
| 1 |
| 2 |
| 3 |
| 3 |
=
| 3 |
| 2 |
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