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b)4,35-3/200=4,35-15/1000=4,35-0,015=4,335
c)7/8-0,78=875/1000-0,78=0,875-0,78=0,095
d)5,4-5/4=5,4-1 1/4=5,4-1 25/100=5,4-1,25=4,15
e)1 2/5-0,285+3 7/20=1 4/10-0,285+3 35/100=1,4-0,285+3,35=1,115+3,35=4,465
f)3 3/25-(0,8-1/4)=3 12/100-(0,8-25/100)=3,12-(0,8-0,25)=3,12-0,55=2,57