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Răspuns :

8/10 = 5/10 + 3/10
8/10 = 4/10 + 4/10
8/10 = 1/10 + 3/10 + 4/10

6/9 = 2/9 + 4/9
6/9 = 3/9 + 3/9
6/9 = 1/9 + 2/9 + 3/9