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b)(1/2*5/6):5=5/12*1/51/12
c)1/3:1 4/9=1/3*9/13=3/13
d)13:(2 1/6*1/4)=13:(13/6*1/4)=13*13/24=169/24=7 1/24
e)1/3*( 1 1/2:2/3)=1/3*(3/2*3/2)=1/3*9/4=3/4
f)2/7:(1/7:3)=2/7:(1/7*1/3)=2/7*1/21=2/147