y2 |
4 |
1 |
2 |
NA |
NB |
y1+1 |
2 |
y12 |
4 |
1 |
4 |
| ||
2 |
| ||
2 |
| ||
2 |
3 |
3 |
NA |
1 |
2 |
NB |
1 |
2 |
NA |
NB |
NA |
NB |
(x1+ x2)2+(y1+y2-1)2 |
NA |
NB |
|
-2k |
4+k2 |
8 |
4+k2 |
NA |
NB |
-2k |
4+k2 |
8 |
4+k2 |
-12k2 |
(4+ k2)2 |
NA |
NB |
NA |
NB |
x2 |
7 |
y2 |
2 |
x2 |
a2 |
y2 |
b2 |
3 |
x2 |
a2 |
y2 |
b2 |
A.
| B.
| C.
| D.
|
A.有且只有一条 | B.有且只有两条 |
C.有且只有三条 | D.有且只有四条 |
x2 |
3 |
16y2 |
p2 |
x2 |
a2 |
y2 |
b2 |
| ||
3 |
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