Вычислите: 1) 12: 3,2+(6-(3 7/8-1 5/6)*6/7); 2) - вопрос №8004376112326378156672467568212513 от vladislavkraso 04.11.2021 03:58

Question

Математика: Вычислите: 1) 12: 3,2+(6-(3 7/8-1 5/6)*6/7); 2) (4 6/7: (5/6+8/21)-2 5/13)*8 2/3.

vladislavkraso · Answer

1) 12:3,2+(6-(3 7/8-1 5/6)*6/7) = 8,1) 12 : 3,2 = 3,75,2) 3 7/8 - 1 5/6 = 31/8 - 11/6 = 93/24 - 44/24 = 49/24 = 2 1/24,3) 2 1/24 * 6/7 = 49/24 * 6/7 = 7/4 = 1 3/4  (или 1,75),4) 6 - 1,75 = 4,25,5) 3,75 + 4,25 = 8,2) (4 6/7:(5/6+8/21)-2 5/13)*8 2/3 = 14,1) 5/6 + 8/21 = 35/42 + 16/42 = 51/42 = 17/14 = 1 3/14,2) 4 6/7 : 1 3/14 = 34/7 : 17/14 = 34/7 * 14/17 = 2 * 2 = 4,3) 4 - 2 5/13 = 1 8/13,4) 1 8/13 * 8 2/3 = 21/13 * 26/3 = 2 * 7 = 14...