А) 2,75 / 11 + 3 1/3 = 0,25 + 3 1/3 = 1/4 + 3 1/3 = 3/12 + 3 4/12 = 3 7/12= 42/12
2,5 - 0,4 (- 3 1/3) = 2 1/2 - 4/10 (-10/3) = 2 1/2 + 4/3 = 2 3/6 + 8/6 = 3 5/6 = 23/6
42/12 / 23/6 = 21/23
б) (1,4 - 3,5 / 1 1/4) / 2,4 + 3,4 / 2 1/8 = (14/10 - 35/10 / 5/4) /24/10 + 34/10 / 17/8 = (14/10 - 14/5) / 24/10 + 8/5 = - 14/10 / 24/10 + 8/5 = - 7/12 + 8/5 =
- 35/60 + 96/60 = 61/60 = 1 1/60