题目内容
(1)计算 (π-2009)0+
+|
-2|+(
)-1;
(2)先化简后求值:当x=
-1时,求代数式
-
•
的值.
| 12 |
| 3 |
| 1 |
| 2 |
(2)先化简后求值:当x=
| 2 |
| 1 |
| x+1 |
| 1 |
| x2-1 |
| x2-2x+1 |
| x+1 |
(1)原式=1+2
-(
-2)+2
=1+2
-
+2+2
=5+
(2)原式=
当x=
-1时,原式=1.
| 3 |
| 3 |
=1+2
| 3 |
| 3 |
=5+
| 3 |
(2)原式=
| 2 |
| (x+1)2 |
当x=
| 2 |
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