Question

simplificando a equação x-x²/ x²-1 / (x/x+1 -x)

Answer 1

                   $\frac{ \frac{x-x^2}{x^2-1} }{ \frac{x}{x+1} -x} \\ \\ = \frac{ \frac{x(1-x)}{(x+1)(x-1)} }{ \frac{x-x^2-x}{x+1} } \\ \\ = \frac{ \frac{x}{x+1} }{ \frac{-x^2}{x+1} } \\ \\ = \frac{x}{-x^2} \\ \\ =- \frac{1}{x}$