Вычислите сумму: а)3 3/4+1\5 ; б)7 9/20+7\30

Question

Вычислите сумму: а)3 3/4+1\5 ; б)7 9/20+7\30

Answer 1

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

Answer 2

A) 3 3/4 +1/5=3 15/20+ 4/20=3 19/20 б) 7 9/20+7/30=7 27/60+14/60=7 41/60