Ответ:

Пошаговое объяснение:

№3

(6-2 4/5)*3 1/8 - 1 3/5:1/4= 3,6

1) 6-2 4/5 = 5 5/5 - 2 4/5 = 3 1/5

2) 3 1/5 * 3 1/8 = 16/5 * 25/8 = 10

3) 1 3/5  : 1/4 = 8/5 * 4 = 32/5 = 6 2/5 = 6,4

4) 10 - 6,4 = 3,6

№4

4 1/6*(1 1/2 - 3/5)+(3/4+5/6)*6= 13 1/4

1) 1 1/2 - 3/5 = 1 5/10 - 6/10 = 15/10 - 6/10 = 9/10

2) 4 1/6 * 9/10 = 25/6 * 9/10 = 15/4 = 3 3/4 = 3,75

3) 3/4+5/6 = 9/12 + 10/12 = 19/12

4) 19/12 * 6 = 19/2 = 9,5

5) 3 3/4 + 19/2 = 3 3/4 + 38/4 = 3 3/4 + 9 2/4 = 13 1/4

№5

7*2 6/7+ 53/12:(7/9-9/4)= 17

1) 7 * 2 6/7 = 7 * 20/7 = 20

2) 7/9-9/4 = 28/36 - 81/36 = - 53/36

3) 53/12 : (-53/36) = 53/12 : (- 36/53) = -3

4) 20 + (-3) = 17

Пошаговое объяснение:

№1

1) 6 - 2. 4/5 = 5. 5/5 - 2. 4/5 = 3. 1/5

2) 3. 1/5 * 3. 1/8 = 16/5 * 25/8 = 2/1 * 5/1 = 10/1 = 10

3) 1. 3/5 : 1/4 = 8/5 * 4/1 = 32/5 = 6. 2/5

4) 10 - 6. 2/5 = 9. 5/5 - 6. 2/5 = 3. 3/5

№2

1. 1/2 - 3/5 = 1. 5/10 - 6/10 = 15/15 - 6/10 = 9/10

2) 4. 1/6 * 9/10 = 25/6 * 9/10 = 5/2 * 3/2 = 15/4 = 3. 3/4

3) 3/4 + 5/6 = 9/12 + 10/12 = 19/12

4) 19/12 * 6 = 19/2 * 1 = 19/2 = 9 1/2

5) 3. 3/4 + 9. 1/2 = 3. 3/4 + 9. 2/4 = 12. 5/4 = 13. 1/4

№3

1) 7/9 - 9/4 = 28/36 - 81/36 = -53/36

2) 53/12 : (-53/36) = 53/12 * (-36/53) = -36/12 = -3

3) 7 * 2. 6/7 = 7 * 20/7 = 1 * 20/1 = 20/1 = 20

4) 20 + (-3) = 20 - 3 = 17