Correto: 3/8-2/8=1/8, 5/9+3/9=8/9, 23/34-18/34=5/34, 2/5-1/5=1/5, 5/8-6/8=1/8, Incorreto: 3/4-3/5=7/6, 3/4+2/4=2/4 , 7/4-5/4=1/5, 2/5-1/5=4/5, 2/4+5/4=4/4,

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