Сократите дроби.
1) 3a - 3b / a^2 - b^2 = 3(a-b) / (a-b)(a+b) = 3 / a+b 2) 39 x^3y / 26 x^2 y^2 = 3x / 2y 3) 5y / y^2 - 2y = 5y / y(y-2) = 5 / y-2