x |
2y |
x+y |
A.1 | B.
| C.
| D.1+
|
x |
2y |
(1+2)(x+y) |
x |
2y |
3(x+y) |
x |
2y |
x+y |
3 |
3 |
A.(a,-f(a)) | B.(a,f(-a)) | C.(-a,f(a)) | D.(-a,-f(a)) |
A.(-∞,2) | B.(2,+∞) | C.(-∞,-2)∪(2,+∞) | D.(-2,2) |
ln22 |
22 |
ln32 |
32 |
lnn2 |
n2 |
2n2-n-1 |
2(n+1) |
x |
2 |
1 |
2x |
A.{-1,1} | B.{x|x<0或x=1} | C.{x|x>0或x=-1} | D.{x|x≤-1或x≥1} |
A.-3 | B.-1 | C.1 | D.3 |
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