g(x1)+g(x2) |
x1+x2 |
6 |
x |
6 |
x1 |
6 |
x2 |
g(x1)+g(x2) |
x1+x2 |
6ln(x1x2)+3
| ||||
x1+x2 |
3
| ||||
x1+x2 |
6 |
x1+x2 |
6 |
t |
g(x1)+g(x2) |
x1+x2 |
A.(-∞,1) | B.(-∞,2) | C.(-∞,1] | D.(-∞,2] |
A.y=x3 | B.y=3x | C.y=log3x | D.y=cosx |
1 |
3x+2013 |
1 |
2 |
A.
| B.
| C.
| D.
|
1 |
2 |
A.增函数且f(x)>0 | B.增函数且f(x)<0 |
C.减函数且f(x)>0 | D.减函数且f(x)<0 |
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