题目
题型:解答题难度:一般来源:南昌
2a |
a-1 |
a |
1-a |
2 |
答案
2a |
a-1 |
a |
a-1 |
a |
a-1 |
1 |
a |
1 |
a-1 |
当a=
2 |
原式=
1 | ||
|
1 | ||
|
| ||
2 |
核心考点
举一反三
1 |
x-y |
1 |
x+y |
2y |
x2+2xy+y2 |
3 |
2 |
3 |
2 |
A.
| ||||||
B.
| ||||||
C.
| ||||||
D.
|
x2-1 |
x2-2x+1 |
x-1 |
x2+x |
2 |
x |
1 |
x-1 |
x |
x2-1 |
(2)计算:
1 | ||
1+
|
1 | ||||
|
1 | ||||
|
1 | ||||
|
(3)先化简,再求值:
1 |
a+2 |
4 |
4-a2 |
3 |
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