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folosind cifrele 1,3,5,7 toate fractiile subunitare

Răspuns :

1/3, 1/5, 1/7, 3/5, 3/7, 5/7
1 pe 3,1pe5,1pe7,3pe1,3pe5,3pe7,5pe1,5pe1,5pe3,5pe7,7pe1,7pe3,7pe5.