Де Денис Ответ 14a^4b / 49a^3b^2 = = (14/49) * (a^4/a^3) * (b/b^2) = = (2/7) * a^(4-3) * b^(1-2) = = 2/7 * a * b^(-1) = = 2a / 7b 3x / (x^2+4x) = = 3x / x(x+4) = = 3/(x+4)