1 |
2 |
f(x1)-f(x2) |
x1-x2 |
a+1 |
x |
3 |
2 |
a+1 |
2 |
3 |
2 |
a+1 |
x |
x2-ax+a+1 |
x |
x2-ax+a+1 |
x |
a |
2 |
|
|
2 |
2 |
f(x1)-f(x2) |
x1-x2 |
x2-ax+a+1 |
x |
a+1 |
2 |
a+1 |
2 |
a+1 |
2 |
a+1 |
2 |
a+1 |
2 |
-(a-3)(a+1) |
4 |
-(a-3)(a+1) |
4 |
A.不存在 | B.存在,有且仅有一条 |
C.存在,有且恰有两条 | D.存在,但条数不确定 |
x |
2x-1 |
1 |
3 |
2b |
a |
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