Решить, примеры с дробями: 2/9*27/28 = 1/3+1/5 = 1/2+1/7 = 5/6-3/4 = 2/3-4/7 = 3/10+1/2 = 9/20+3/4 = 15 1/2-2 3/8 = 10 3/4-5 5/8 = 5 5/6+6 1/6 = 2 1/3*1 1/2 = 1 1/5*2 1/2 = 7 2/9+4 = 14 5/8-1/8 = 7-15/18 = 4-3/11 = 2 1/3-1/2 = 4 1/7-1/5 = 3 1/4+4 1/5 = 2 1/3+5 1/2 =