a |
b |
a |
b |
a |
b |
a |
. |
b |
a |
. |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
k2+1+2kcos(β-α) |
a |
b |
k2+1-2kcos(β-α) |
k2+1+2kcos(β-α) |
k2+1+2kcos(β-α) |
π |
2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
PQ |
P0Q0 |
a |
b |
a |
b |
a |
b |
7 |
a |
2b |
a |
b |
a |
b |
a |
3 |
b |
1 |
2 |
| ||
2 |
c |
a |
b |
d |
a |
b |
c |
d |
AB |
CD |
AB |
AD |
AC |
A.直角梯形 | B.矩形 | C.菱形 | D.正方形 |
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