Выражение +a(x+y)+xy)/(a^2-(x-c)a-cx))*((a^2-c^2)/(a^2-x^2)) 2. (ac+m^2-m(a+c)/bc+m^2+m(b+c))/((a^2-m^2)/(b^2-m^2)) 3. ((m^2+2mn+n^2)/bc+m^2+m(b+c))/((m^3-n^3)/m^3+2m^2n+2mn+n^2)) 4. ((a^4-b^4)/(a^2+b^2-2ab))/((a^3+a^2b+ab^2+b^3)/a-b))