题目内容
(1)计算:|-
|-
+(π-4)0-sin30°;
(2)化简:(
-
)•
.
| 1 |
| 2 |
| 9 |
(2)化简:(
| a2 |
| a-2 |
| 4 |
| a-2 |
| 1 |
| a2+2a |
(1)原式=
-3+1-
=-2;
(2)原式=
•
=
•
=
.
| 1 |
| 2 |
| 1 |
| 2 |
(2)原式=
| a2-4 |
| a-2 |
| 1 |
| a2+2a |
=
| (a+2)(a-2) |
| a-2 |
| 1 |
| a(a+2) |
=
| 1 |
| a |
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