x2-2x+2+t |
1 |
2 |
1-t |
x |
| ||
3 |
1+t |
1-t |
1+t |
1-t |
|
1+t |
1-t |
2 |
3 |
b |
3 |
(x1+x2)2-4x1x2 |
(
|
2 |
3 |
2-b |
| ||
3 |
1 |
2 |
1+t |
1-t |
|
3 |
3 |
1 |
2 |
x2-4x+5 |
2x-4 |
1 |
f′(x) |
2 |
3 |
7 |
6 |
1 |
100 |
A.
| B.-
| C.lg2 | D.-lg2 |
x+1 |
A.2 | B.4 | C.2
| D.10 |
|
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
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