Ответ(ы) на вопрос:
Гость =(x -9y)/(x -3y)(x +3y) + 3y/x(x -3y) = =(x(x -9y) +3y(x +3y)) /x(x -3y)(x +3y) = =(x -9xy +3xy +9y) /x(x -3y)(x +3y) = =(x -6xy +9y) /x(x -3y)(x +3y) = =(x -3y) /x(x -3y)(x +3y) = =(x -3y) /x(x +3y)
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