A.(1,-2),5 | B.(1,-2),
| C.(-1,2),5 | D.(-1,2),
|
5 |
A.D=E | B.D=F | C.E=F | D.D=E=F |
A.y=3x2或y=-3x2 | B.y=3x2 |
C.y2=-9x或y=3x2 | D.y=-3x2或y2=9x |
A.(-2,3) | B.(-2,3) | C.(-2,-3) | D.(2,-3) |
A.2x-y+1=0 | B.2x+y+1=0 | C.2x-y-1=0 | D.2x+y-1=0 |
A.(2,-3)、r=13 | B.(2,-3)、r=
| C.(2,3)、r=
| D.(-2,3)、r=13 |
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