Выполните действие 1)(4 5\6 -2,5)*12-27 *5\9 2)(2 7\12+1,75 )\13+2,5 \ 3 3\4

№ 1. (4 5/6 - 2,5) * 12 - 27 * 5/9 = 13
1) 4 5/6 - 2,5 = 29/6 - 25/10 = 145/30 - 75/30 = 70/30 = 7/3
2) 7/3 * 12 = 7 * 4 = 28
3) 27 * 5/9 = 3 * 5 = 15
4) 28 - 15 = 13

№ 2. (2 7/12 + 1,75)/13 + 2,5 : 3 3/4 = 1
1) 2 7/12 + 1,75 = 2 7/12 + 1 3/4 = 2 7/12 + 1 9/12 = 3 16/12 = 4 4/12 = 4 1/3
2) (4 1/3)/13 = 13/3 : 13 = 13/3 * 1/13 = 1/3
3) 2,5 : 3 3/4 = 25/10 : 15/4 = 25/10 * 4/15 = (5*2)/(5*3) = 2/3
4) 1/3 + 2/3 = 3/3 = 1