x2 |
a2 |
y2 |
b2 |
| ||
2 |
10 |
| ||
2 |
c |
6 |
| ||
2 |
3 |
x2 |
36 |
y2 |
9 |
|
32k |
1+4k2 |
28 |
1+4k2 |
1+k2 |
1+k2 |
(x1+x2)2-4x1x2 |
1+k2 |
(
|
| ||
1+4k2 |
10 |
1 |
2 |
1 |
2 |
A.a=0或a=3或a=-1 | B.a=0或a=3 |
C.a=3或a=-1 | D.a=0或a=-1 |
A.x+2y+3=0 | B.x-2y+5=0 | C.x+2y-3=0 | D.2x-y+4=0 |
v |
A.x-y-3=0 | B.x+y+3=0 | C.x+y-3=0 | D.x-y+3=0 |
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