x1+x2 |
2 |
f(x1+x2) |
2 |
A.0个 | B.1个 | C.2个 | D.3个 |
x1+x2 |
2 |
x1+x2 |
2 |
f(x1+x2) |
2 |
2x1+x2 |
2 |
x1+x2 |
2 |
x1+x2 |
2 |
f(x1+x2) |
2 |
x1+x2 |
2 |
x1+x2 |
2 |
f(x1+x2) |
2 |
log2( x1+x2) |
2 |
x1+x2 |
x1+x2 |
2 |
x1+x2 |
x1+x2 |
2 |
f(x1+x2) |
2 |
3x-2 |
A.(
| B.(
| C.(
| D.(
|
A.a>5,或a<2 | B.2<a<5 |
C.2<a<3,或3<a<5 | D.3<a<4 |
1 |
5 |
2 |
lg(1-x) |
A.(1,+∞) | B.(0,1)∪(1,+∞) |
C.(-∞,-1)∪(-1,+0) | D.(-∞,0)∪(0,1) |
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