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7 i 7/8 , 6 i 17/28
c)
5 i 1/15 , 2 i 7/20
3 5/8 + 1 6/8 + 2 4/8 = 7 7/8
1 24/28 + 2 7/28 + 2 14/28 = 6 17/28
B)
4 5/10 - 2 6/10 = 1 9/10
3 4/18 - 1 15/18 = 1 7/18
C)
4 5/30 - 1 18/30 + 2 15/30 = 2 17/30 + 2 15/30 = 5 2/30 = 5 1/15
3 5/20 - 2 12/20 + 1 14/20 = 13/20 + 1 14/20 = 2 7/20