Решение и ответ.. а)1,5-1 1/2 *(1 2/5+2/15) б)-3 9/14: 3/7 в) (2 2/3+1 56)/(-1 1/2)

А)1,5-1 1/2 *(1 2/5+2/15) = 1,5 - 3/2 * (7/5 + 2/15) = 1,5 - 3/2 * (21/15 + 2/15) = 1,5 - 3/2 * 23/15 = 1,5 - 23/10 = 1,5 - 2,3 = - 0,8
б)-3 9/14: 3/7 = - 51/14 : 3/7 = - 51/14 * 7/3 = - 17/2 = - 8,5
в) (2 2/3+1 5/6)/(-1 1/2) = (8/3 + 11/6) / (- 3/2) = (16/6 + 11/6) / (- 3/2) = 27/6 / (- 3/2) = 
= 27/6 * (- 2/3) = - 9/3 = - 3