Question

пожалуйста срочно нужно)​

Answer 1

Ответ: 1) а) 4 2/9

б) 2 1/6

в) 7 3/7

2)9 322/375

3) 1/8

4) 4

Пошаговое объяснение:

1) а) 2 - 2/9 - 1 1/9 + 3 5/9 = 1 9/9 - 2/9 - 1 1/9 + 3 5/9 = 1 7/9 - 1 1/9 + 3 5/9 = 6/9 + 3 5/9 = 3 11/9 = 4 2/9

б) 8 5/9 - (4 2/9 + 2 1/6) = 8 5/9 - (4 2/9 + 2 1/6) = 8 5/9 - (4 4/18 + 2 3/18) = 8 5/9 - 6 7/18 = 8 10/18 - 6 7/18 = 2 3/18 = 2 1/6

в) 4 + 3 3/7 = 3 7/7 + 3 3/7 = 6 10/7 = 7 3/7

2) (х - 4.7) * 7.5 = 38.69

7.5х - 35.25 = 38.69

7.5х = 38.69+35.25

7.5х = 73.94

х= 73.94 : 7.5

х = 3697/375 = 9 322/375  

3) 9/56 - (7/15 - 5/12) * (3/14 + 1/2) = 9/56 - (28/60 - 25/60) * (3/14 + 7/14) = 9/56 - 3/60*10/14 = 3*10/60*14= 9/56 - 30/840 = 135/840 - 30/840 = 105/840 = 15/120 = 3/24 = 1/8

4) 3 3/5 * 1 1/9 = 18/5 * 10/9 = 4