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b)2 5/8*4=21/8*4/1=84/8=10 1/2
c)3/4*1/2=3/8
d)16/21*7/8=112/168
e)3 3/5*1 2/9=18/5*11/9=198/45=4 18/45
f)2/3*7/21*9/16=126/1008
g)8/9:2=8/9*1/2=8/18
h)4:3/4=4/1*4/3=5 1/3
i)5/7:3/14=5/7*14/3=3 7/21
j)10 2/3:8/9=32/3*9/8=288/24=12
k)7/20:1 5/9=7/20*9/14=63/280
l)6 4/11:3 1/2=70/11*2/7=1 67/77