求微分方程的通解 2(ln y-x)y′ =y

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求微分方程的通解 2(ln y-x)y′ =y
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求微分方程的通解 2(ln y-x)y′ =y
求微分方程的通解 2(ln y-x)y′ =y

求微分方程的通解 2(ln y-x)y′ =y
∵2(ln y-x)y′ =y ==>2y(ln y-x)y′ =y²
==>y²dx+2xydy=2ylnydy
==>y²dx+xd(y²)=lnyd(y²)
==>d(xy²)=d[y²(lny-1/2)]
==>xy²=y²(lny-1/2)+C (C是积分常数)
==>x=lny-1/2+C/y²
∴原方程的通解是x=lny-1/2+C/y² (C是积分常数).