y=1+xe^y求y的二阶导数
回答
爱扬教育
2022-06-07
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y'=e^y+xy'e^y
y'=e^y/(1-xe^y)
y''=dy'/dx
=[y'e^y(1-xe^y)-(-e^y-xy'e^y)e^y]/(1-xe^y)
=(2-x)e^(2y)/(1-xe^y)
扩展资料
因为y=1+xe^y，则1-xe^y=2-y，得y'=e^y/(2-y)
即dy/dx=e^y/(2-y)
dy/dx=e^y/(2-y)
==>d(dy/dx)/dx=d(e^y/(2-y))
==>d(dy/dx)/dx=[e^y*dy*(2-y)-e^y*(-dy)]/(2-y)^2
因为dy/dx=e^y/(2-y)，则
==>d(dy/dx)/dx=[e^2y+e^2y/(2-y)]/(2-y)^2
==>d(dy/dx)/dx=e^2y[1+1/(2-y)]/(2-y)^2
即dy/dx=e^y/(2-y)
dy/dx=e^y/(2-y)
==>d(dy/dx)/dx=d(e^y/(2-y))
==>d(dy/dx)/dx=[e^y*dy*(2-y)-e^y*(-dy)]/(2-y)^2
因为dy/dx=e^y/(2-y)，则
==>d(dy/dx)/dx=[e^2y+e^2y/(2-y)]/(2-y)^2
==>d(dy/dx)/dx=e^2y[1+1/(2-y)]/(2-y)^2