а) у²+у/у² =y*(y+1)/y²= (y+1)/y
b) (a²-2a)/(a²-4) =a(a-2) /((a-2)(a+2)) = a /(a+2)
а) y^2+1/y;
b) a(a-2)/a^2-2^2=a(a-2)/(a-2)(a+2)=a/(a+2).
