题目内容
(1)计算:(-
)-1-
+(1-
)0+4sin60°;
(2)化简:(1+
)•
.
| 1 |
| 2 |
| 21 |
| 2 |
(2)化简:(1+
| 4 |
| a2-4 |
| a+2 |
| a |
(1)原式=-2-
+1+4×
=-1-
+2
;
(2)原式=
•
=
•
=
.
| 21 |
| ||
| 2 |
=-1-
| 21 |
| 3 |
(2)原式=
| a2 |
| a2-4 |
| a+2 |
| a |
=
| a2 |
| (a+2)(a-2) |
| a+2 |
| a |
=
| a |
| a-2 |
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