题目内容
(1)计算:-24+20100+2-1+
-sin30°;
(2)先化简,再求值:(1+
)÷
,其中a=
+1.
| 16 |
(2)先化简,再求值:(1+
| 3 |
| a-2 |
| a2-1 |
| 2a-4 |
| 2 |
(1)原式=-16+1+
+4-
=-9;
(2)原式=
•
=
•
=
,
当a=
+1时,原式=
=
.
| 1 |
| 2 |
| 1 |
| 2 |
(2)原式=
| a-2+3 |
| a-2 |
| 2(a-2) |
| (a+1)(a-1) |
| a+1 |
| a-2 |
| 2(a-2) |
| (a+1)(a-1) |
| 2 |
| a-1 |
当a=
| 2 |
| 2 | ||
|
| 2 |
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