dy/dx-2y/x=x^2,y|x=1=0的特解 .dy/dx+y/x=sinx/x ,y|x=π=1的特解
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(x^2)dy+(y^2)dx=dx-dy
dy/dx,y=(1+x+x^2)e^x
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dy/dx=x+y
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x=sint+1 y=2cos3t dy/dx
求解微分方程dy/dx+x/2y=1/2