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Daca prin 5 robinete curg 125 litri apa,aflati cati litri de apa curg prin 7 robinete

Răspuns :

5rob.. 125litri
7rob..×litri
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{5,7}d.p{125,×}=>5/125=7/×=>×=125•7
____=875:5=175
5
5rob..125litri
7rob..175litri
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5 robinete ..........125 l

7    ''       ''  ...........x

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x =7*125/5 =875/5 = 175  litri