Răspuns
Explicație pas cu pas:a) 3/1+7/9=27/9+7/9=34/9...(Nota:numitor comun este 9,).....b)4-5/11=4/1-5/11=44/11-5/11=39/11.......c)5/12+4/9=15/36+16/36=31/36...(numitor comun 36)..........d)11/15-3/10=22/30-9/30=13/30...(Numitor comun=30)......e)4,7/8+7,5/6=39/8+47/6=117/24+329/24=446/24....simplificam cu 2 si rezulta...223/12.......f)...8,3/4-5,7/10=35/4-57/10=175/20-114/20=61/20....asta e raspunsul!O seara buna!