x2 |
a2 |
y2 |
b2 |
| ||
2 |
2 |
| ||
2 |
c2 |
a2 |
a2-b2 |
a2 |
1 |
2 |
2
| ||
2 |
x2 |
8 |
y2 |
4 |
x2 |
8 |
y2 |
4 |
8k2 |
1+2k2 |
8k2-8 |
1+2k2 |
(1+k2)(x1-x2)2 |
(1+k2)[(x1+x2)2-4x1x2] |
| ||
1+2k2 |
1 |
k |
1 |
k |
| ||
k2+2 |
1 |
2 |
16(1+k2)2 |
(k2+2)(1+2k2) |
(1+2k2)(k2+2) |
2 |
3(k2+1) |
2 |
64 |
9 |
64 |
9 |
A.一条线段 | B.椭圆的一部分 |
C.双曲线的一部分 | D.抛物线的一部分 |
A.4条 | B.3条 | C.2条 | D.1条 |
2 |
2 |
PF2 |
PF1 |
3 |
OA |
OB |
OC |
x2 |
4 |
y2 |
16 |
ax2 |
16 |
y2 |
4 |
x2 |
a2 |
y2 |
b2 |
| ||
2 |
2π |
3 |
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