СРОЧНО буду очень благодарен если за 5 мин
( ( x - 1 )/( x + 1 )) + (( x + 1 )/( x - 1 )) = ( ( x - 1 )^2 + ( x + 1 )^2 ) / ( x^2 - 1 ) = ( x^2 - 2x + 1 + x^2 + 2x + 1 ) / ( x^2 - 1 ) = ( 2x^2 + 2 ) / ( x^2 - 1 )
_x-1_ + _x+1_ = _(x-1)·(x-1)+(x+1)(x+1)_ = _x²-x-x+1+x²+x+x+1_ = x+1 x-1 (x+1)(x-1) (x+1)(x-1) = _ 2x²+2_= _2·(x+1)_ = _2_ (x+1)(x-1) (x+1)(x-1) x-1.