Решить пример (5,7-7,1)-(3 2/3-2/15)-2,1

(5,7 - 7,1) - (3 2/3 - 2/15) - 2,1 = -4 7/30.1) 5,7 - 7,1 = -1,4 ;2) 3 2/3 - 2/15 = 11/3 - 2/15 = (11*5 - 2*1)/15 = 53/15 = 3 8/15 ;3) -1,4 - 3 8/5 = -1,4 - 53/15 = 14/10 - 53/15 = 7/5 - 53/15 = (7*3 - 53)/15 = -32/15 = -2 2/15 ;4) -2 2/15 - 2,1 = - 32/15 - 21/10 = (-32 * 2 - 21 * 3)/30 = -127/30 = -4 7/30.Ответ: -4 7/30.