题目内容
(1)计算:(-1)2011-|-7|+
×(
-π)0+(
)-1;
(2)先化简,再求值:(
-1)÷
,其中x=tan60°-1.
| 9 |
| 7 |
| 1 |
| 5 |
(2)先化简,再求值:(
| 1 |
| x+2 |
| x2+2x+1 |
| x2-4 |
(1)原式=-1-7+3×1+5
=1-7+3+5
=2;
(2)原式=
÷
=-
×
=-
,
∵x=tan60°-1=
-1,
∴当x=
-1时,原式=-
=1-
.
=1-7+3+5
=2;
(2)原式=
| 1-x-2 |
| x+2 |
| (x+1)2 |
| (x+2)(x-2) |
=-
| x+1 |
| x+2 |
| (x+2)(x-2) |
| (x+1)2 |
=-
| x-2 |
| x+1 |
∵x=tan60°-1=
| 3 |
∴当x=
| 3 |
| ||
|
| 3 |
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