题目内容
(1)计算:(x+1)0-
+|-
|
(2)解方程:2x2-2x-1=0
(3)化简:
-
.
| 12 |
| 3 |
(2)解方程:2x2-2x-1=0
(3)化简:
| x-1 |
| x2-1 |
| x |
| x2-x |
(1)原式=1-2
+
=1-
;
(2)∵2x2-2x-1=0的二次项系数a=2,一次项系数b=-2,常数项c=-1,
∴x=
=
=
,
∴x1=
,x2=
;
(3)原式=
-
=
-
=-
.
| 3 |
| 3 |
| 3 |
(2)∵2x2-2x-1=0的二次项系数a=2,一次项系数b=-2,常数项c=-1,
∴x=
-b±
| ||
| 2a |
2±
| ||
| 4 |
1±
| ||
| 2 |
∴x1=
1+
| ||
| 2 |
1-
| ||
| 2 |
(3)原式=
| x-1 |
| (x-1)(x+1) |
| x |
| x(x-1) |
=
| 1 |
| x+1 |
| 1 |
| x-1 |
=-
| 2 |
| (x-1)(x+1) |
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