Respostas
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A)4/7+5/7=5+4/7=9/7
B)8/3- 1/3=8-1/3=7/3
C)3/2+6/5
15+12/10
27/10
D)7/4+7/6=21/12+14/12=35/12
E)2/5+1/8+3/4=16/40+5/40+30/40=51/40
F)1/3+7/9-5/6=6/18+14/18-15=20/18-15/18=
5/18
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