#1
5/9,11/11
#2
12*2/3=8
#3
(1-12/17)*2 4/15=2/3
1)1-12/17=17/17-12/17=5/17
2)5/17*34/15=2/3
#4
1 3/4x=3:1 3/4
x=3*4/7=12/7=1 5/7
#5
3 2/7+1/3=3 6/21+7/21=3 13/21
#6
7 1/24-4 5/6+3 7/8=7 1/24-4 20/24+3 21/24=6 25/24-4 20/24+3 21/24=2 5/24+3 21/24=5 25/24=6 1/24