1 |
x |
1 |
a |
1 |
b |
1 |
a |
1 |
b |
1 |
a |
1 |
b |
a+b |
ab |
2
| ||
ab |
2 | ||
|
ab |
|
1 |
x |
|
|
1 |
a |
1 |
b |
1 |
a |
1 |
x |
|
|
1 |
x |
2 |
2x+1 |
A.[3,+∞) | B.[0,+∞) | C.[2,+∞) | D.R |
1 | ||
1+
|
A.M={x|x≠0},N={y|y≠0} |
B.M={x|x<0且x≠-1,或x>0},N={y|y<0,或0<y<1,或y>1} |
C.M={x|x≠0},N={y|y∈R} |
D.M={x|x<-1,或-1<x<0,或x>0=,N={y|y≠0} |
A.(0,1) | B.(-∞,1) | C.(-∞,0) | D.(0,+∞) |
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