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a) 4/9*3/4=1/3
b) 5/8*7/12=35/96
c) 7/8*24/33=7/11
d) 1 1/8*4/15=9/8*4/15=3/10
e) 2 3/5:5=13/5*1/5=13/25
f) 1 5/7:6=12/7*1/6=2/7
g) 6 1/2:3 1/4=13/2:13/4=13/2*4/13=2
h) 7 1/3:2 2/5=22/3:12/5=22/3*5/12=55/18=3 1/18
i) 2*13*4/8=13
j) 8 3/4*4/7*3=35/4*4/7*3=15
k) 2 1/7*7*2 2/5=15/7*2*12/5=72/7=10 2/7
l) 4*15*9/12=45