题目内容
(1)计算:
-22-4sin45°;
(2)计算:
-
.
| 8 |
(2)计算:
| 2 |
| a2-1 |
| 1 |
| a-1 |
(1)原式=2
-4-4×
=-4;
(2)原式=
=
=-
.
| 2 |
| ||
| 2 |
(2)原式=
| 2-(a+1) |
| (a+1)(a-1) |
=
| 1-a |
| (a+1)(a-1) |
| 1 |
| a+1 |
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题目内容
| 8 |
| 2 |
| a2-1 |
| 1 |
| a-1 |
| 2 |
| ||
| 2 |
| 2-(a+1) |
| (a+1)(a-1) |
| 1-a |
| (a+1)(a-1) |
| 1 |
| a+1 |