Сначала сократив дроби,а потом приводя их к общему знаменателю вычислите: а)25/80+45/60
б)36/300+14/40-350/1000
в)42/120+20/32-28/160
г)20/45+26/54
д)1424-39/90+15/100
е)45/72-33/144-20/64​​

А) 25/80+45/60 = 5/16 + 3/4 =
= 5/16 + 12/16 = 17/16 = 1 1/16

б) 36/300+14/40-350/1000 =
= 3/25 + 7/20 - 7/20 = 3/25

в) 42/120+20/32-28/160 =
= 7/20 + 5/8 - 7/40 =
= 14/40 + 25/40 - 7/40 =
= 7/40 + 25/40 = 32/40 = 4/5

г) 20/45 + 26/54=
= 4/9 + 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 =
= 30/48 - 26/48 = 4/48 = 1/12