1 |
2 |
x2 |
a2 |
y2 |
b2 |
a2 |
c |
F1M |
F2N |
MN |
15 |
1 |
2 |
a2 |
c |
F1M |
F2N |
MN |
(y1-y2) 2 |
y12+y22-2y1y2 |
y12+y22+2|y1y2| |
4|y1y2| |
60c2 |
60c2 |
15 |
3 |
x2 |
4 |
y2 |
3 |
x2 |
4 |
y2 |
3 |
y2+y1 |
x2-x1 |
y2x1+x2y1 |
y1+y2 |
2x1x2-m(x1+x2) |
x1+x2-2m |
8k2m |
4k2+3 |
4m2k2-12 |
4 k2+3 |
4 |
m |
4 |
m |
4 |
m |
x2 |
25 |
y2 |
9 |
A.
| B.
| C.6 | D.7 |
x2 |
a2 |
y2 |
b2 |
| ||
3 |
OM |
OA |
OB |
x2 |
m2 |
y2 |
m2-7 |
7 |
x2 |
16 |
y2 |
9 |
A.64 | B.20 |
C.16 | D.随α变化而变化 |
x2 |
a2 |
y2 |
b2 |
| ||
2 |
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