а)3 3/4+1\5 = (3*4+3)/4+1/5=15/4+1/5 = (15*5+4*1)/20=79/20 = 3 19/20
б)7 9/20+7\30 =(7*20+9)/20+7/30 =149/20+7/30 = (3*149+2*7)/60=461/60=7 41/60
а)3 3/4+1\5 = (3*4+3)/4+1/5=15/4+1/5 = (15*5+4*1)/20=79/20 = 3 19/20
б)7 9/20+7\30 =(7*20+9)/20+7/30 =149/20+7/30 = (3*149+2*7)/60=461/60=7 41/60