题目内容
(1)计算:(-
)-1+(2008-π)0+
tan30°
(2)先化简,再求值:
÷(x-1-
),其中x=
.
| 1 |
| 2 |
| 3 |
(2)先化简,再求值:
| x2-2x |
| x2-1 |
| 2x-1 |
| x+1 |
| 1 |
| 2 |
(1)原式=-2+1+
×
=-2+1+1
=0;
(2)原式=
÷
=
•
=
,
当x=
时,原式=
=-2.
| 3 |
| ||
| 3 |
=-2+1+1
=0;
(2)原式=
| x(x-2) |
| (x-1)(x+1) |
| x2-1-(2x-1) |
| x+1 |
=
| x(x-2) |
| (x-1)(x+1) |
| x+1 |
| x(x-2) |
=
| 1 |
| x-1 |
当x=
| 1 |
| 2 |
| 1 | ||
|
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