Question

ДОПОМОЖІІІІІІІІІІІТЬ​

Answer 1

Ответ:

1. Б

2. Г

3. Б

4. В

5. 1) 4/7; 2) 4 1/2

6. 1) 2 4/5; 2) 2

7. 2 1/3

8. 2 2/3

9. 60 1/5

Пошаговое объяснение:

1. 1/6 • 12/13 = 2/13

2. 10/21 : 5/7 = 10/21 • 7/5 = 2/3

3. 16 • 3/4 = 16 • 3 : 4 = 12

4. 28 : 4/5 = 28 • 5/4 = 28 • 5 : 4 = 35

5. 1) 4/9 • 1 2/7 = 4/9 • 9/7 = 4/7

2) 1 13/14 • 2 1/3 = 27/14 • 7/3 = 9/2 = 4 1/2

6. 1) 2 6/25 : 4/5 = 56/25 • 5/4 = 14/5 = 2 4/5

2) 5 1/3 : 1 3/5 = 16/5 : 8/5 = 16/5 • 5/8 = 2/1 = 2

7. 2 5/8 : (5 - 2 5/22 • 1 4/7) = 2 5/8 : (5 - 49/22 • 11/7) = 2 5/8 : (5 - 7/2) = 2 5/8 : (5 - 3 1/2) = 2 5/8 : 1 1/2 = 21/8 • 2/3 = 7/3 = 2 1/3

8. 5 3/14 х - 4 8/21 х = 2 2/9

5 9/42 х - 4 16/42 х = 2 2/9

4 51/42 х - 4 16/42 х = 2 2/9

35/42 х = 2 2/9

х = 2 2/9 : 35/42

х = 20/9 • 42/35

х = 8/3

х = 2 2/3

9. v1 = 68; v2 = v1 : 1 1/3; S = 203 км; t = 1 1/5

v2 = 68 : 1 1/3 = 68 : 4/3 = 68 • 3/4 = 51

v(1+2) = 68+51 = 119

v(1+2) • t = 119 • 1 1/5 = 119 • 6/5 = 714/5 = 142 4/5

S - 142 4/5 = 203 - 142 4/5 = 60 1/5

Answer 2

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