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最佳答案:(1+x²)dy+xydx=0==>dy/y=-xdx/(1+x²)==>ln│y│=(-1/2)ln(1+x²)+ln│C│ (C是积分常数)==>y=C/√
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最佳答案:分离变量法:dy/y=x^2dx积分: ln|y|=x^3/3+C1得y=Ce^(x^3/3)
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最佳答案:∵把原微分方程两端同乘以1/(x+y),得dx-dy=(dx+dy)/(x+y) ==>d(x-y)=d(x+y)/(x+y)==>d(x-y)-d(x+y)/
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最佳答案:dsolve('Dy=y^3-y','x')ans =[ 1/(1+exp(2*x)*C1)^(1/2)][ -1/(1+exp(2*x)*C1)^(1/2)]