Выполните действие: 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)

Question

Математика

Валерьяныч

24 августа, 03:33

Выполните действие: 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)

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Илья · Answer 1

1) (1/12 + 1/6) : (3/8 - 1/4) =

(1/12+2/12) : (6/16-4/16) =

1/4:1/8=1/4*8/1=2

2) (1 - 4/9) : (1/3 - 1/4) =

(9/9-4/9) : (4/12-3/12) =

5/9:1/12=5/9*12/1=20/3=6 2/3

3) (1/3 - 5/16) : (1/6 - 1/8) =

(16/48-15/48) : (4/24-3/24) =

1/48:1/24=1/48*24/1=1/2

4) (5/7 - 2/3) : (4/9 - 5/12) =

(15/21-14/21) : (16/36-15/36) =

1/21:1/36=1/21*36/1=12/7=1 5/7

Бронислава · Answer 2

1) (1/12+1/6) : (3/8-1/4) = (1/12+2/12) : (3/8-2/8) =

3/12:1/8=1/4*8/1=2;

2) (1-4/9) : (1/3-1/4) = (9/9-4/9) : (4/12-3/12) =

5/9:1/12=5/9*12/1=20/3=6 2/3;

3) (1/3-5/16) : (1/6-1/8) = (16/48-15/48) : (4/24-3/24) =

1/48:1/24=1/48*24/1=1/2;

4) (5/7-2/3) : (4/9-5/12) = (15/21-14/21) : (16/36-15/36) =

1/21:1/36=1/21*36/1=12/7=1 5/7.