А) 5/9 + 1/6 = (2*5 + 3*1)/18 = 13/18
б) 5/8 - 3/4 = 5/8 - 6/8 = - 1/8
в) 4/7 * 14/15 = (4/7) * (2*7)/15 = 8/15
г) 20/27 : 5/6 = 8/9
Выполняем действия
а) 3 1/3 + 1 2/5 = 10/3 + 7/5 = (50+21) /15 = 4 11/15
б) 2 1/12 - 1 7/12 = (25-19)/12 = 6/12 = 1/2
в) 24 * 3/8 = 24/8 * 3 = 3*3 = 9