Ответ:

Пошаговое объяснение:

1

а)

1) 1 5/6 - 1 1/3 = 1 5/6 - 1 2/6 = 3/6 = 1/2

2) 1/2 * 3 = 3/2 = 1 1/2

б)

4/15 * (2 5/6 + 2 1/6) = 4/15 * 4 6/6 = 4/15 * 5 = 20/15 = 1 5/15 = 1 1/3

в)

1 1/2 * (3 2/3 + 1 2/3) = 3/2 * 4 4/3 = 3/2 * 16/3 = 16/2 = 8

2.

а)

12/28n - 10/28n + 5/28n = 7/28n = 1/4n

б)

1 8/18а + 2 12/18а - 1 15/18а = 2 5/18а

3.

1 3/4х + 1 1/2 = 10,9 : 4

1 3/4х + 1 1/2 = 2,725

1 3/4х = 2,725 - 1 1/2

1 3/4х = 2,725 - 3/2

7/4х = 2,725 - 1,5

7/4х = 1,225

х = 1,225 : 7/4

х = 1,225 : 1,75

х = 0,7 или 7/10

4.

(5 2/9у * 3) + (3 1/3 * 3) -

7 2/3у =

1) 47/9у * 3 = 47/3у = 15 2/3у

2) 10/3 * 3 = 30/3 = 10

3) 15 2/3у + 10 - 7 2/3у = 8у + 10

При у = 3 1/8

4) (8 * 3 1/8) + 10 = (8 * 25/8) + 10 = 25 + 10 = 35

Ответ: 35