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a 2/3:5/6= 2/3*6/5=4/5
b 2: 1/4= 2*4=8
c 7/9 :3=7/9*1/3=7/27
19.
a 8
b 45
c 20
20.
a 28:3=3,5
3,5*3=10,5
b 3,75:3=1,25
1,25*2=2,5