二阶常微分方程联立解有y1 y2 两变数,并且有两组二阶常微分方程(对x微分),初始值已知,y1'' = -a*exp(y1)*y1' - b*y1 + c*y2y2'' = -d*y2 + e*y1 - f*sin(wx)其中a,b,c,d,e,f,w都是已知常数,且y1(0)=c1,y1'(0)=0,y2(0)=c2,y2
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