3 |
a |
3 |
a |
3 |
a |
3 |
a |
3 |
a |
3 |
a |
3 |
a |
1 |
a-2b |
1 |
b |
1 |
a-b |
1 |
b |
1 |
a-2b |
1 |
b |
1 |
a-b |
1 |
b |
1 |
a |
1 |
b |
1 |
a+b |
1 |
ab |
1 |
a |
1 |
b |
A.①④ | B.②③ | C.①③ | D.②④ |
x2-4 |
x+1 |
A.(-∞,-2]∪(-1,2) | B.[-2,-1]∪[2,+∞) | C.(-∞,-2]∪[-1,2) | D.(-∞,-2]∪(-1,2] |
A.
| B.|a|>|b| | C.
| D.a+b>ab |
1 |
a |
1 |
b |
b |
a |
a |
b |
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