题目内容
(1)先化简,再求值:
-
,其中a=4+
;
(2)计算(
+1)0-|sin60°-1|-(
)-1+(-1)3.
| 1 |
| a+2 |
| 4 |
| 4-a2 |
| 3 |
(2)计算(
| 2 |
| ||
| 2 |
(1)原式=
+
=
=
,
当a=4+
时,原式=2-
;
(2)原式=1-|
-1|-(
-1)-1
=-
.
| 1 |
| a+2 |
| 4 |
| (a+2)(a-2) |
=
| a+2 |
| (a+2)(a-2) |
=
| 1 |
| a-2 |
当a=4+
| 3 |
| 3 |
(2)原式=1-|
| ||
| 2 |
| 3 |
=-
| ||
| 2 |
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