[leej]

本人系新手用的win7系统，结果发现解方程时结果异于或复杂于计算值，不知是安装问题还是别的，举例见下，特此求解，哪位大侠指点下谢谢了
>> syms x0 y0
>> [x,y]=dsolve('Dx=y','Dy=-2*x','x(0)=x0','y(0)=y0')


x =

(exp(2^(1/2)*i*t)*(2*x0 - 2^(1/2)*i*y0))/4 + (2*x0 + 2^(1/2)*i*y0)/(4*exp(2^(1/2)*i*t))


y =

(2^(1/2)*i*exp(2^(1/2)*i*t)*(2*x0 - 2^(1/2)*i*y0))/4 - (2^(1/2)*i*(2*x0 + 2^(1/2)*i*y0))/(4*exp(2^(1/2)*i*t))
里边出现了i？？这不应该有的呀，求指点