solvefor y, x/(x+y)-2y=0

解答

求解

y, \frac{x}{x + y} - 2 y = 0

y = - \frac{x + x ( x + 2 )}{2}, y = - \frac{x - x ( x + 2 )}{2}

求解步骤

\frac{x}{x + y} - 2 y = 0

在两边乘以

x + y

x - 2 y (x + y) = 0

解

x - 2 y (x + y) = 0 : y = - \frac{x + x ( x + 2 )}{2}, y = - \frac{x - x ( x + 2 )}{2}

y = - \frac{x + x ( x + 2 )}{2}, y = - \frac{x - x ( x + 2 )}{2}

2 + \frac{4}{x ^{2} - 3 x - 6} = 0

\frac{x}{10} = \frac{2.5}{x}

\frac{- 16}{k} = - 11

\frac{3 x}{\frac{4}{x} - 5} = x + 1

\frac{4}{( x + 1 )} = \frac{x}{5}