А) 25/80 + 45/60 = 25/80 + 3/4 = (254)/(804) + 3/4 = 100/320 + 3/4 = 100/320 + 240/320 = 340/320 = 17/16
Б) 36/300 + 12/40 - 350/1000 = 3/25 + 3/10 - 7/20 = (34)/(254) + 6/20 - 14/20 = 12/100 + 6/20 - 14/20 = 12/100 - 8/20 = 12/100 - 40/100 = -28/100 = -7/25
В) 42/120 + 20/32 - 28/160 = 7/20 + 5/8 - 7/40 = 14/40 + 25/40 - 7/40 = 32/40 = 8/10 = 4/5
Г) 20/45 + 26/54 = 4/9 + 13/27 = (43)/(93) + 13/27 = 12/27 + 13/27 = 25/27
Д) 14/24 - 39/90 + 15/100 = 7/12 - 13/30 + 3/20 = 35/60 - 26/60 + 9/60 = 18/60 = 3/10
Е) 45/72 - 33/144 - 20/64 = 5/8 - 11/48 - 5/16 = 30/48 - 11/48 - 15/48 = 4/48 = 1/12
А) 25/80 + 45/60 = 25/80 + 3/4 = (254)/(804) + 3/4 = 100/320 + 3/4 = 100/320 + 240/320 = 340/320 = 17/16
Б) 36/300 + 12/40 - 350/1000 = 3/25 + 3/10 - 7/20 = (34)/(254) + 6/20 - 14/20 = 12/100 + 6/20 - 14/20 = 12/100 - 8/20 = 12/100 - 40/100 = -28/100 = -7/25
В) 42/120 + 20/32 - 28/160 = 7/20 + 5/8 - 7/40 = 14/40 + 25/40 - 7/40 = 32/40 = 8/10 = 4/5
Г) 20/45 + 26/54 = 4/9 + 13/27 = (43)/(93) + 13/27 = 12/27 + 13/27 = 25/27
Д) 14/24 - 39/90 + 15/100 = 7/12 - 13/30 + 3/20 = 35/60 - 26/60 + 9/60 = 18/60 = 3/10
Е) 45/72 - 33/144 - 20/64 = 5/8 - 11/48 - 5/16 = 30/48 - 11/48 - 15/48 = 4/48 = 1/12