Подробно 5класс 14•(1/2+1/3+1/4) 1/3•6/7-1/7•3/4 1 3/11-27/44•4/9 1 2/3+14/15•5/7

14•(1/2+1/3+1/4) = 14 * (6/12 + 4/12 + 3/12) = 14 * 13/12 = 182/12 = 15 2/12

1/3•6/7-1/7•3/4 = 1/1 * 2/7 - 3/28 = 2/7 - 3/28 = 8/28 - 3/28 = 5/28 

1 3/11-27/44•4/9 = 14/11 - 3/11 * 1/1 = 14/11 - 3/11 = 11/11 = 1

1 2/3+14/15•5/7 = 5/3 + 2/3 * 1/1 = 5/3 + 2/3 = 7/3 = 2 1/2