设P(x0,y0),A1(-a,0),A2(a,0)
PA1斜率=y0/(x0+a)=1/2,PA2斜率=y0/(x0-a)=2
y0=x0/2+a/2,y0=2x0-2a,x0=5a/3,y0=4a/3
P点在双曲线上,[(5a/3)^2]/a^2-[(4a/3)^2]/b^2=1,a^2/b^2=1
y=x y=-x
打字不易,
设P(x0,y0),A1(-a,0),A2(a,0)
PA1斜率=y0/(x0+a)=1/2,PA2斜率=y0/(x0-a)=2
y0=x0/2+a/2,y0=2x0-2a,x0=5a/3,y0=4a/3
P点在双曲线上,[(5a/3)^2]/a^2-[(4a/3)^2]/b^2=1,a^2/b^2=1
y=x y=-x
打字不易,