题目内容
(1)已知x=
+1,求(1-
)÷
的值.
(2)计算:2
(
+
)-
.
2 |
1 |
x |
x2-2x+1 |
x |
(2)计算:2
2 |
2 |
1 | ||
|
| ||||
|
(1)原式=
÷
=
•
=
,
当x=
+1时,原式=
=
;
(2)原式=4+2-(3-2)
=6-1
=5.
x-1 |
x |
(x-1)2 |
x |
x-1 |
x |
x |
(x-1)2 |
1 |
x-1 |
当x=
2 |
1 | ||
|
| ||
2 |
(2)原式=4+2-(3-2)
=6-1
=5.
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