x2 |
a2 |
y2 |
b2 |
1 |
2 |
c |
a |
1 |
2 |
x2 |
16 |
y2 |
12 |
PF1•PF2 |
1 |
PF1•PF2 |
1 |
16 |
|PF1|2+|PF2|2-|F1F2|2 |
2|PF1|×|PF2| |
(|PF1|+|PF2|)2-2|PF1|×|PF2|-|F1F2|2 |
2|PF1|×|PF2| |
48-2|PF1|×|PF2| |
2|PF1|×|PF2| |
24 |
|PF1|×|PF2| |
24 |
16 |
1 |
2 |
π |
3 |
π |
3 |
x2 |
16 |
y2 |
9 |
A.6 | B.5 | C.4 | D.3 |
x2 |
a2 |
y2 |
b2 |
A.(0,
| B.(
| C.(1,
| D.(
|
x2 |
m |
y2 |
n |
x2 |
p |
y2 |
q |
PF1 |
PF2 |
A.
| B.
| C.m-p | D.n-q |
x2 |
a2 |
y2 |
b2 |
1+
| ||
2 |
A.45° | B.60° | C.90° | D.120° |
x2 |
25 |
y2 |
9 |
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