Question

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Answer 1

Ответ:

Пошаговое объяснение:

21.

1) 17 * 8/51 = 3*8/1 = 24/1 = 24

2) 2. 4/9 : 3. 2/3 = 22/9 : 11/3 = 22/9 * 3/11 = 2/3 * 1/1 = 2/3

3) 24 - 2/3 + 3. 1/3 =

23. 3/3 - 2/3 + 3. 1/3 =

23. 1/3 + 3. 1/3 = 26. 2/3

22.

1) 1/20 + 6/25 = 5/100 + 24/100 = 29/100

2) 29/100 * 8. 1/3 = 29/100 * 25/3 = 29/4 *1/3 = 29/3 = 9. 2/3

3) 9. 2/3 - 1. 1/6 = 9. 4/6 - 1. 1/6 = 8. 3/6 = 8. 1/2

4) 8. 1/2 * 2 = 17/2 * 2 = 34/2 = 17

23.

1) 12. 3/8 : 2. 1/16 = 99/8 : 33/16 = 99/8 * 16/33 = 3/1 * 2/1 = 6/1 = 6

2) 6 - 5. 5/21 = 5. 21/21 - 5. 5/21 = 16/21

3) 16/21 * 7/8 = 2/3 * 1/1 = 2/3

4) 2/3 + 3. 2/15 = 10/15 + 3. 2/15 = 3. 12/15 = 3. 4/5

24.

1) 6. 3/4 : 4. 1/2 = 27/4 : 9/2 = 27/4 * 2/9 = 3/2 * 1/1 = 3/2 = 1. 1/2

2) 1. 1/2 + 2. 5/7 = 1. 7/14 + 2. 10/14 = 3. 17/14 = 4. 3/14

3) 4. 3/14 : 8. 3/7 = 59/14 : 59/7 = 59/14 * 7/59 = 7/14 = 1/2

4) 1/2 - 2/5 = 5/10 - 4/10 = 1/10

25.

1) 1. 3/7 + 4. 5/21 = 1. 9/21 + 4. 5/21 = 5. 14/21 = 5. 2/3

2) 5. 2/3 - 5. 1/4 = 5. 8/12 - 5. 3/12 = 5/12

3) 5/12 * 1. 5/7 = 5/12 * 12/7 = 5/7

4) 5/7 + 3. 1/7 = 3. 6/7

26.

1) 6. 9/10 + 2. 11/20 = 6. 18/20 + 2. 11/20 = 8. 29/20 = 9. 9/20

2) 9. 9/20 * 2. 3/5 = 189/20 * 13/5 = 2457/100 = 24. 57/100

3) 3. 1/2 * 2. 7/10 = 7/2 * 27/10 = 189/20 = 9. 9/20

4) 24. 57/100 - 9. 9/20 = 24. 57/100 - 9. 45/100 = 15. 12/100 = 15. 3/25

27.

1) 2. 1/2 - 1. 1/18 = 2. 9/18 - 1. 1/18 = 1. 8/18 = 1. 4/9

2) 1. 4/9 : 9. 1/4 = 13/9 : 37/4 = 13/9 * 4/37 = 52/333

3) 8. 1/9 - 52/333 = 8. 37/333 - 52/333 = 7. 370/333 - 52/333 = 7. 318/333 = 7. 106/111

4) 7. 106/111 + 3. 1/24 = 7. 848/888 + 3. 37/888 = 10. 885/888 = 10. 295/296

28.

1) 7/10 : 2. 1/2 = 7/10 : 5/2 = 7/10 * 2/5 = 14/50 = 7/25

2) 1/3 : 5/24 = 1/3 * 24/5 = 24/15 = 8/5 = 1. 3/5

3) 7/25 + 1. 3/5 = 7/25 + 1. 15/25 = 1. 22/25

4) 1. 22/25 - 22/25 = 1

29.

1) 9/20 : 9/100 = 9/20 * 100/9 = 100/20 = 5

2) 3. 61/100 : 1/5 = 361/100 : 1/5 = 361/100 * 5/1 = 361/20 * 1/1 = 361/20 = 18. 1/20

3) 5 + 18. 1/20 = 23. 1/20

4) 23. 1/20 - 18. 63/100 = 23. 5/100 - 18. 63/100 = 22. 105/100 - 18. 63/100 = 4. 42/100 = 4. 21/50

30.

1) 1. 805/1000 : 1. 39/100 = 1805/1000 : 139/100 = 1805/1000 * 100/139 = 1805/10 * 1/139 = 1805/1390 = 361/278 = 1. 83/278

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

3) 2. 1/2 - 1. 83/278 = 2. 139/278 - 1. 83/278 = 1. 56/278 = 1. 28/139

4) 1. 28/139 + 1. 3/5 = 1. 140/695 + 1. 417/695 =

2. 557/695