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B.1 1/3 - 1/10= 1 10/30-3/30=1 7/30
C.1 1/4*3/4= 5/4*3/4=15/16
D.7/100:7/9=7/100*9/7=9/100
F.5 1/4-2,1=5 1/4-2 1/10=5 5/20-2/20=3/20
G. 3 5/10*1/7+1 8/10-2/9=35/10*1/7+1 8/10-2/9=5/10+ 18/10- 2/9=45/90+162/90-20/90=187/90=2 7/90