题目内容
(1)计算:(-
)-2-16÷(-2)3+(π-tan60°)0-2
cos30°.
(2)先化简,再求值:(
-
)÷
,其中a=
+1.
| 1 |
| 3 |
| 3 |
(2)先化简,再求值:(
| 1 |
| a+1 |
| a-2 |
| a2-1 |
| 1 |
| a+1 |
| 3 |
(1)原式=9-16÷(-8)+1-2
×
=9;
(2)原式=[
-
]•(a+1)
=
•(a+1)
=
,
当a=
+1时;
原式=
=
.
| 3 |
| ||
| 2 |
=9;
(2)原式=[
| a-1 |
| (a+1)(a-1) |
| a-2 |
| (a+1)(a-1) |
=
| 1 |
| (a+1)(a-1) |
=
| 1 |
| a-1 |
当a=
| 3 |
原式=
| 1 | ||
|
=
| ||
| 3 |
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