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2\7+1\7=?+4\7=?-3\5=?+1\5=?

Răspuns :

2/7+1/7=3/7+4/7=1-3/5=2/5+1/5=3/5
2\7+1\7=3\7+4\7=7\7=1=5\5-3\5=2\5+1\5=3\5