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3 tractoare ara o suprafata agricola in 210 h .In cat timp ara aceiasi suprafata 7 tractoare?

Răspuns :

210 : 7 = 30
30 * 3= 90  h
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{3,7}--ip->{210, x} => 3•210=7•x=>x=3•210/7 , x= 3•30, x=90h