用例子吧dy/dt+2x=0dx/dt+3y=0>> [x,y]=dsolve('Dy+2*x=0','Dx+3*y=0') x = C1*exp(6^(1/2)*t)+C2*exp(-6^(1/2)*t)y = -1/3*6^(1/2)*(C1*exp(6^(1/2)*t)-C2*exp(-6^(1/2)*t))
用dsolve求解析解，用ode45,ode23,ode15s求数值解
