|
5 |
a |
1 |
b |
A.
| B.
| C.1 | D.4 |
5 |
a |
1 |
b |
5 |
a |
1 |
b |
4a+5b |
20 |
5 |
4 |
5b |
4a |
a |
5b |
5 |
4 |
9 |
4 |
b |
a |
A.[
| B.[e,
| C.[e,7] | D.[
|
|
A.(2,0) | B.(-2,0) | C.(0,2) | D.(0,-2) |
A.(0,0) | B.(-1,1) | C.(-1,3) | D.(2,-3) |
A.(-1,3) | B.(-∞,-1)∪(3,+∞) | C.[-1,3] | D.(-∞,-1]∪[3,+∞) |
c |
2d |
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