无解的方差，不赋初值一样解不出来
警告的含义：表达式太复杂
dsolve('Dy=((60-x)/y-(y/(x^2+y^2-60*x))*(2*75*(80+400*(60-x/y))*400/(10000-50*(600-((x^2+y^2-60*x)/y)))+60))/(1+(60-x)/y*(y/(x^2+y^2-60*x))*(2*75*(80+400*(60-x/y))*400/(10000-50*(600-((x^2+y^2-60*x)/y)))+60))');
Warning: Explicit solution could not be found; implicit solution returned.
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