Ответы на вопрос:
1) ( 1/x ) - ( 1/x - 1) = ( x - 1 - x ) / ( x*( x - 1)) = ( - 1) / ( x^2 - x ) 2) [ - 1 / ( x^2 - x) ^ - 1 = (x^2 - x) / ( - 1 ) 3) (4/x + 1) - (4/x ) = ( 4x - 4*( x + 1 ) ) / ( x^2 + x ) = ( 4x - 4x - 4 ) / (x^2 + x ) = = ( - 4 ) / ( x^2 + x ) 4) [ ( - 4 ) / ( x^2 + x ) ] ^ - 1 = ( x^2 + x ) / ( - 4 ) 5) (x^2 - x) / ( - 1 ) + ( x^2 + x ) / - 4 = ( 4x^2 - 4x + x^2 + x ) / - 4 = = ( 5x^2 - 3x ) / - 4 = - 1,25x^2 + 0,75x ответ ( - 1,25x^2 + 0,75x )
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