题目内容
(1)计算20+2sin45°-
;
(2)化简(
+
)÷(
)2.
| 1 | ||
|
(2)化简(
| 1 |
| a-2 |
| a2-1 |
| a2+a-2 |
| a |
| a+2 |
(1)原式=1+×
-(
-1)=2;
(2)原式=(
+
)×
=
×
=
.
| ||
| 2 |
| 2 |
(2)原式=(
| 1 |
| a-2 |
| a+1 |
| a+2 |
| (a+2)2 |
| a2 |
| a2 |
| (a-2)(a+2) |
| (a+2)2 |
| a2 |
| a+2 |
| a-2 |
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