[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
, L9 p, P$ L+ c5 C+ z1 k dy2/dr=-10*y1
' {6 |8 I3 R' X0 M8 e7 t! ] dy3/dr=120*y2*r^2
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" o! ^' a2 S- d/ U" [6 f7 B (y1*r^2)(r=0)=0
(y2)(r=R)=0.2
; i7 K5 M% f5 R/ x/ K# {y3(r=0)=0
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: ?: Y9 ~8 N& q5 @2 u请教高手用matlab该如何解决这题，谢谢！