[求助]请高手解决个微分方程，扣谢

keith

d(y1*r^2)/dr=-6.4*y2*r^2
dy2/dr=-10*y1
c7 `9 j0 k, R0 Z" M6 G1 c ! U3 h5 r' A2 Q+ e+ |* G! E5 bdy3/dr=120*y2*r^2
/ _/ k3 u' p8 f; J2 S% b. d 9 e" ?; ^6 X9 x# F
" y' s# d% l* w5 ~0 K% _ (y1*r^2)(r=0)=0
(y2)(r=R)=0.2
y3(r=0)=0

请教高手用matlab该如何解决这题，谢谢！