matlab解常微分方程组，求解有问题

运行没有错误呀，这个是运行的答案 >> [x,y]=dsolve('Dx-a*x*y+b*x','Dy+a*x*y+b*y','t') x = 0 C1/exp(1/b/exp(b*t)*C1)/exp(C2*C1)/(-1+1/exp(1/b/exp(b*t)*C1)/exp(C2*C1)*a)/exp(b*t) y = C1*exp(-b*t)