dy/dx+(1-2x/x^2)*y=1的通解
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dy/dx+(1-2x/x^2)*y=1的通解dy/dx+(1-2x/x^2)*y=1的通解dy/dx+(1-2x/x^2)*y=1的通解y=(1-x)(1-2x)=2x^2-3x+1dy/dx=y''
dy/dx+(1-2x/x^2)*y=1的通解
dy/dx+(1-2x/x^2)*y=1的通解
dy/dx+(1-2x/x^2)*y=1的通解
y=(1-x)(1-2x)=2x^ 2-3x+1dy/dx=y'=2*2x+3=4x+3dx分之dy 即是y的导数.
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反函数的二阶导数疑问设dy/dx=y',则dx/dy=1/y',应视为y的函数则d2x/dy2=d(dx/dy)/dy(定义)=d(1/(dy/dx)) / dy=d(1/(dy/dx))/dx * dx/dy(复合函数求导,x是中间变量)=-y''/(y')^2 * (1/y')=-y''/(y')^3d(1/(dy/dx))/dx * dx/dy
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