x2 |
a2 |
y2 |
b2 |
a-c |
2 |
b |
2 |
a |
b |
a |
2 |
a-c |
2 |
b2-ac |
2b |
a-c |
2 |
b2-ac |
2b |
1 |
2 |
| ||
2 |
b-
| ||
0-
|
b2+ac |
b(c-a) |
b |
a |
b2+ac |
a(c-a) |
3 |
|
x2 |
a2 |
y2 |
b2 |
A.相交 | B.相切 | C.相离 | D.不确定 |
2 |
2 |
A.(x-4)2+(y-2)2=1 | B.x2+(y-2)2=4 |
C.(x+2)2+(y+1)2=5 | D.(x-2)2+(y-1)2=5 |
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