1 |
x+1 |
a |
x+1 |
2x2+2x+a |
x+1 |
2(x+
| ||||
x+1 |
1 |
2 |
1 |
2 |
-1-
| ||
2 |
-1+
| ||
2 |
1 |
2 |
1 |
2 |
-1-
| ||
2 |
-1+
| ||
2 |
-1+
| ||
2 |
-1+
| ||
2 |
1-2a |
1-t2 |
2 |
t-1 |
2 |
t-1 |
2 |
1-t2 |
2 |
t+1 |
2 |
t-1 |
2 |
1-t2 |
2 |
t+1 |
2 |
t+1 |
2 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
(1-x)n |
1 |
x |
2ax+a2-1 |
x2+1 |
lna+lnx |
x |
A.0<a<
| B.a≥e | C.a≥
| D.a≥4 |
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