3-1 2/5
2/3*3/4
4/5*5
5/9*1/5
1 1/3*3/4
2 1/4*1 1/3

в 4 , 5 ,6сокращение, если что

1) 3 - 2/5 = 2 * 5/5 - 2/5 = 2 3/52) 2/3 * 3/4 = 1/23)4/5 * 5 = 20/5 = 44) 5/9 * 1/5 = 1/95)11/3 * 3/4 = 11/4 = 2 3/46)21/4* 11/3 = 7/4 * 11 = 77/4 = 19 1/4