3x^2+3y^2-8x=0
(x-4/3)+y^2=(4/3)^2,园心R(4/3,0),rR=4/3
k(L)=-3/4
Q(4a,-4-3a)
QR⊥L
S四边形QMRN(min)=QM(min)*rR=(4/3)*QM(min)
QM(min)=QN(min)
k(QR)=[(4+3a)/((4/3-4a)]=-1/*k(L)=4/3
a=-4/15
Q(-16/5,-16/5)
QM^2=QN^2=QR^2-r(R)^2=
QM(min)=
方法正确,请自己计算
3x^2+3y^2-8x=0
(x-4/3)+y^2=(4/3)^2,园心R(4/3,0),rR=4/3
k(L)=-3/4
Q(4a,-4-3a)
QR⊥L
S四边形QMRN(min)=QM(min)*rR=(4/3)*QM(min)
QM(min)=QN(min)
k(QR)=[(4+3a)/((4/3-4a)]=-1/*k(L)=4/3
a=-4/15
Q(-16/5,-16/5)
QM^2=QN^2=QR^2-r(R)^2=
QM(min)=
方法正确,请自己计算