Ответы на вопрос:
1) 1/8x -(7x+y)/8xy = (y-7x-y)/8xy = -7x/8xy = -7/8y 2) 28x^2/(7x-7) -4x = 4x^2/(x-1) -4x = 4x(x/(x-1) -1) = 4x(x-x+1)/(x-1) = 4x/(x-1)
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