题目
题型:解答题难度:一般来源:不详
x2-1 |
x2-2x+1 |
x2-2x |
x-2 |
答案
(x+1)(x-1) |
(x-1)2 |
x(x-2) |
x-2 |
1 |
x |
=
2x |
x-1 |
当x=2sin45°-1=
2 |
原式=-
2 |
核心考点
举一反三
x |
x+1 |
1 |
x2-1 |
x |
x-2 |
x |
x+2 |
4x |
x-2 |
a2-ab |
a2 |
a |
b |
b |
a |
1 |
x-1 |
x2 |
x2-1 |
2 |
a2+ab |
b |
a2-b2 |
ab |
b-a |
a2-2ab+b2 |
1 |
2 |
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