а)7-3/5=6 5/5-3/5=6 2/5
б)5-27/31=4 31/31-27/31=4 4/31
в)3-21/31=2 31/31-21/31=2 10/31
г)4-20/63=3 63/63-20/63=3 40/63
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а)7-3/5=6 5/5-3/5=6 2/5
б)5-27/31=4 31/31-27/31=4 4/31
в)3-21/31=2 31/31-21/31=2 10/31
г)4-20/63=3 63/63-20/63=3 40/63