3 |
3 |
(
|
3 |
3 |
3 |
x2 |
4 |
x2 |
4 |
x02 |
4 |
x12 |
4 |
x02-x12 |
4 |
y0-y1 |
x0-x1 |
y0+y1 |
x0+x1 |
y02-y12 |
x02-x12 |
1 |
4 |
3 |
x2 |
4 |
3 |
|
(x3-x4)2+(y3-y4)2 |
(1+m2)[(y3+y4)2-4y3y4] |
4(1+m2) |
4+m2 |
2
| ||
|
1+m2 |
1 |
2 |
3 |
| ||
4+m2 |
4
| ||
t2+3 |
4
| ||
t+
|
2 |
2 |
3 |
2 |
3 |
x2 |
v |
y2 |
图6 |
10 |
x2 |
8 |
y2 |
4 |
3 |
PQ |
QA |
QB |
8 |
3 |
ADB |
EM |
MB |
EN |
NB |
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