题目内容
(1)计算:16÷(-2)3+(2009-
)0-|tan60°-1|+(
)-1×
;
(2)先化简,再求值:
÷(x-1-
),其中x=
.
| π |
| 6 |
| 1 |
| 3 |
| 2 | ||
|
(2)先化简,再求值:
| x2-2x |
| x2-1 |
| 2x-1 |
| x+1 |
| 1 |
| 2 |
(1)原式=-16÷8+1-(
-1)+3×
=-2+1-
+1+2
=
…(8分)
(2)原式=
÷
=
•
=
,
当x=
时,原式=-2.…(8分)
| 3 |
2
| ||
| 3 |
=-2+1-
| 3 |
| 3 |
=
| 3 |
(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 |
练习册系列答案
相关题目