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7/15+815 = 1
1 5/7 + 2/7 = 2
b) 4 1/5 + 3/5 = 5 4/5
4 2/5 + 2/5 = 5 4/5
4 3/5 + 1/5 = 5 4/5
c) 4 1/5 + 1/5 = 5 2/5
4 2/5 + 1 = 5 2/5
4 3/5 + 4/5 = 5 2/5
Myślę, że pomogłam. ;)