A.8x2+8y2+2x-4y-5=0 | B.8x2+8y2-2x-4y-5=0 |
C.8x2+8y2-2x+4y-5=0 | D.8x2+8y2+2x+4y-5=0 |
(x-1)2+(y+2)2 |
x2+y2 |
AB |
BP |
BC |
CP |
QM |
QN |
A.一条线段,但要去掉两个点 |
B.一个圆,但要去掉两个点 |
C.一个椭圆,但要去掉两个点 |
D.半圆,但要去掉两个点 |
2 |
AP |
| ||
2 |
PB |
A.x2+y2=1 | B.x2-y2=1 | C.x+y=1 | D.x-y=1 |
1 |
2 |
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