Question

3/7 8 5/11 = 
6/25 *5/18 =
1 3/7*21 =
3 3/5 *1 1/(=

Answer 1

6/25*5/18=30/450=3/45
1 3/7*21=10/7*21=210/7=30
3 3/5*1 1/9=18/5*10/9=2/5*10=20/5=4
а с первым непонятно условие

Answer 2

3/45=1/15