Răspunsuri

2014-03-19T23:52:20+02:00
3/9=x/15=4/12=k
3/9=k⇒k=3/9 simplificam cu 3⇒k=1/3
4/12=k⇒k=4/12 simplificam cu 3⇒k=1/3
x/15=k⇒x=15k
inlocuim x=15·1/3⇒x=5