Выполните действия: 1) (1/12+1/6):(3/8-1/4) 2) (1-4/9):(1/3-1/4) 3) (1/3-5/16):(1/6-1/8)...

Question

Выполните действия:

1) (1/12+1/6):(3/8-1/4)
2) (1-4/9):(1/3-1/4)
3) (1/3-5/16):(1/6-1/8)
4) (5/7-2/3):(4/9-5/12)

Answer 1

1) (1/12+1/6):(3/8-1/4) = 3/12:1/8=2
2) (1-4/9):(1/3-1/4) = 5/9 : 1/12 = 5х12/9=20/3
3) (1/3-5/16):(1/6-1/8) = (16/48-15/48):(4/24-3/24) = 1/48:1/24=24/48=1/2
4) (5/7-2/3):(4/9-5/12) = (15/21 - 14/21) : (16/36 - 15/36) = 1/21 x 36 = 36/21