1 |
x |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
a |
x |
1 |
x2 |
1 |
a |
1 |
a |
a |
x |
1 |
x2 |
1 |
a |
1 |
a |
1 |
a |
1 |
a |
1 |
a |
1 |
x |
1 |
e |
1 |
e |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
x1+x2 | ||
2
|
(x1-x2) 2 |
2x1x2(x1+x2) |
x1x2 |
x1+x2 | ||
2
|
x1+x2 | ||
2
|
-(x1-x2) 2 |
2x1x2(x1+x2) |
x1+x2 | ||
2
|
-(x1-x2) 2 |
2x1x2(x1+x2) |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
1 |
3 |
m+1 |
2 |
1 |
3 |
x |
2 |
x |
2 |
A.(e-4,+∞) | B.(-∞,e-1) | C.(0,e-1) | D.(e,+∞) |
lnx |
x |
A.
| B.
| C.
| D.
|
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