Ответ:\(25x^2=(5x)^2\).\(81a^4b^2=(9a^2b)^2\).\(0{,}36m^6=(0{,}6m^3)^2\).Ответ: \((5x)^2;\ (9a^2b)^2;\ (0{,}6m^3)^2\).