1)а)(y^2-2y)/y^2=(y(y-2))/y^2=(y-2)/y
б)(x^2+4x)/(x^2-16)=(x(x+4))/((x-4)(x+4))=x/(x-4)
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1)а)(y^2-2y)/y^2=(y(y-2))/y^2=(y-2)/y
б)(x^2+4x)/(x^2-16)=(x(x+4))/((x-4)(x+4))=x/(x-4)