x2/a2+y2/b2=1
F2(c,0)
则垂线x=c
c2/a2+y2/b2=1
y2=b2(1-c2/a2)=b2(a2-c2)/a2=b^4/a2
|y|=b2/a
MF2=b2/a
F1F2=2c
所以b2/a=2c
a2-c2=2ac
c2+2ac-a2=0
c=(-2a±2√2a)/2=-a±√2a
c/a=-1±√2
0
x2/a2+y2/b2=1
F2(c,0)
则垂线x=c
c2/a2+y2/b2=1
y2=b2(1-c2/a2)=b2(a2-c2)/a2=b^4/a2
|y|=b2/a
MF2=b2/a
F1F2=2c
所以b2/a=2c
a2-c2=2ac
c2+2ac-a2=0
c=(-2a±2√2a)/2=-a±√2a
c/a=-1±√2
0