Приведите дробь к знаменателю 10, 100 или 1000 и запишите её в вид дроби.

Решение:

• 1) \[ \frac{1}{5} = \frac{1 \times 2}{5 \times 2} = \frac{2}{10} \]

• 2) \[ \frac{3}{20} = \frac{3 \times 5}{20 \times 5} = \frac{15}{100} \]

• 3) \[ \frac{4}{125} = \frac{4 \times 8}{125 \times 8} = \frac{32}{1000} \]

• 4) \[ \frac{1}{8} = \frac{1 \times 125}{8 \times 125} = \frac{125}{1000} \]

• 5) \[ \frac{21}{500} = \frac{21 \times 2}{500 \times 2} = \frac{42}{1000} \]

• 6) \[ \frac{5}{2} = \frac{5 \times 500}{2 \times 500} = \frac{2500}{1000} \]

• 7) \[ \frac{13}{4} = \frac{13 \times 250}{4 \times 250} = \frac{3250}{1000} \]

• 8) \[ \frac{51}{25} = \frac{51 \times 4}{25 \times 4} = \frac{204}{100} \]

• 9) \[ \frac{517}{500} = \frac{517 \times 2}{500 \times 2} = \frac{1034}{1000} \]

Ответ:

1. \( \frac{2}{10} \)
2. \( \frac{15}{100} \)
3. \( \frac{32}{1000} \)
4. \( \frac{125}{1000} \)
5. \( \frac{42}{1000} \)
6. \( \frac{2500}{1000} \)
7. \( \frac{3250}{1000} \)
8. \( \frac{204}{100} \)
9. \( \frac{1034}{1000} \)