2x-1 |
2x+1 |
2-x-1 |
2-x+1 |
1-2x |
1+2x |
2x-1 |
2x+1 |
2 |
2x+1 |
2 |
2x1+1 |
2 |
2x2+1 |
2(2x1-2x2) |
(2x1+1)(2x2+1) |
2 |
2x+1 |
1 |
3 |
2 |
23+1 |
7 |
9 |
x |
A.-x+
| B.x-
| C.-x+
| D.-x-
|
1 |
3 |
1 |
8 |
A.(0,
| B.(2,+∞) | C.(
| D.(0,
|
A.一定大于零 | B.一定小于零 |
C.等于零 | D.正负都有可能 |
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 |
π |
2 |
A.y=sinx | B.y=tanx | C.y=cosx | D.y=lnx |
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