1.
3/8 * 9/11=27/88
22/35 * 21/44=3/10
5 3/5 * 1 4/21=18/5 * 25/21=30/7=4 2/7
9 3/7 * 1 3/11=66/7 * 14/11=12
1 1/15 * 5/16=16/15 * 5/16=1/3
7/11 * 2 5/14=7/11 * 33/14=3/2=1 1/2
2.
4/5 * 10/27 * 15/16=5/18
30/77 * 11/18 * 3/25=1/35
4/7 * 35/36 * 3/5=1/9
20/13 * 39/100 * 10/21=2/7
3.
12 * 1/6 * 1 1/2 * 3 3/4 * 4 1/5=(12 * 3 * 15 * 21) / (6 * 2 * 4 * 5)=(3*3*21)/4=189/4=47 1/4
3 * 5 1/4 * 1 1/7 * 5 1/2 * 4/11=(3*21*8*11*4)/(4*7*2*11)=3*3*4=36