А.2/5 * 1 целая 1/4 =
Б.2 1/9 * 4 =
В. 2 1/7 *1 2/5 =
Г. 1 9/11 : 5/4 =
Д.17:1 8/9=
Е.1 1/14 : 1 2/7=
Помогите срочно!

а) 2/5 · 1 целая 1/4 = 2/5 · 5/4 = 2/4 = 1/2

б) 2 1/9 · 4 = 19/9 · 4 = 76/9 = 8 целых 4/9

в) 2 1/7 · 1 2/5 = 15/7 · 7/5 = 15/5 = 3

г) 1 9/11 : 5/4 = 20/11 · 4/5 = (4·4)/(11·1) = 16/11 = 1 целая 5/11

д) 17 : 1 8/9 = 17 : 17/9 = 17 · 9/17 = 9

е) 1 1/14 : 1 2/7 = 15/14 : 9/7 = 15/14 · 7/9 = (5·1)/(2·3) = 5/6