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B) 2/5 :4 *7=2/5*1/4*7=1/5*1/2*7=1/10*7=7/10
C) 18*5/12:15= 3*5/2:15=15/2:15=15/2*1/15=1/2
D)1 1/9*3:11=10/9*3:11=10/3:11=10/3*1/11=10/33
E)2 4/5:7*8= 14/5:7*8=14/5*1/7*8=2/5*8=16/5=3 1/3
F)6*3 1/3 :5= 6* 10/3* 1/5=6*2/3=12/3=4