Предмет: Математика, автор: dima0791

y"=(y')в степени 2 помогите пожалуйста срочно надо

Ответы

Автор ответа: Minsk00
0

Понизим степень уравнения  введя новую функию зависящую от х  z = y' 

     y'' = (y')^2

       z'= z^2

      dz/dx = z^2

       dz/z^2 = dx

интегрируем 

          -1/z = x+C1

           z = -1/(x+C1)

        y'= -1/(x+C1)

        dy/dx =-1/(x+C1)

      dy = -dx/(x+C1)

      Интегрируем 

        y = -ln(x+C1) +C2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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