[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
* {3 \7 N8 t" p. u2 b$ c dy2/dr=-10*y1
: _1 o* n: h, R& ^& R* A3 O$ X 0 `& v; r8 O3 C. }$ q, J$ H l, G8 m( Tdy3/dr=120*y2*r^2
* W* ?/ b2 x% G3 i9 k
(y1*r^2)(r=0)=0
+ H% R! G6 p0 q/ w0 l - V: M/ r; V5 f2 I(y2)(r=R)=0.2
y3(r=0)=0
6 M7 o: g5 E+ g; p
. r& C/ Q3 Q, `请教高手用matlab该如何解决这题，谢谢！