Question

Ajutor cu exprresia din imagine

Answer 1

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