Question

решиет пример 14-13,2:(3 1121-2 415)+(7 14-6 718)*7,2+2,8

Answer 1

14-13,2:(3 1121-2 415)+(7 14-6 718)*7,2+2,8 =  12,5

3 1121-2 415 = 3 55/105 - 2 28/105 = 1 27/105 = 1 9/35

13,2:1 9/35 = 13 2/10 : 44/35 = 13 1/5 * 35/44 = 66/5*35/44=21/2 = 10 1/2= 10,5

7 14-6 718 = 7 9/36 - 6 14/36 = 6  45/36 - 6 14/36 = 31/36

31/36*7,2 = 31/5 = 6 1/5 = 6,2

14 - 10,5 + 6,2 + 2,8 = 12,5