Răspunsuri

2014-07-18T13:22:42+03:00
1)0,5= 5/10=1/2

(5/12+7/20-4/15)  aducem la acelasi numitor

(25+21-16)/60=  (46-16)/60= 30/60= 1/2

b)ma=(80+120)/2= 200/2= 100km/h