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- \( 26 \% = \frac{26}{100} = \frac{13}{50} \)
- \( 45 \% = \frac{45}{100} = \frac{9}{20} \)
- \( 80 \% = \frac{80}{100} = \frac{4}{5} \)
- \( 90 \% = \frac{90}{100} = \frac{9}{10} \)
Ответ: \(\frac{13}{50}\), \(\frac{9}{20}\), \(\frac{4}{5}\), \(\frac{9}{10}\).