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dx/dt=1/8*x*(x-1)*(b^2*x^2*y-b^2*x*y+4*x*m1*a-4*x*m2*a-4*m2*a)/a£»
dy/dt=r*y-(1/2*N*(m1-3*m2)-1/8/a*x*y^2*b^2*(x-1)^2-1/8/a*x^2*y^2*b^2*(x-1)+1/2*y*((m1-m2)*x^2+(1/4*b^2*x*y*(x-1)/a-m1)*x+m2-1/4*b^2*x*y*(x-1)/a)+1/2*x*y*(2*(m1-m2)*x+(1/4*b^2*y*(x-1)/a+1/4*b^2*x*y/a)*x+1/4*b^2*x*y*(x-1)/a-m1-1/4*b^2*y*(x-1)/a-1/4*b^2*x*y/a))£»
m1=1; m2=4; a=0.5; b=2; W=10; N=50; r=0.5;
³õʼÌõ¼þ£ºx(0)=0.2; y(50)=-1;
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