Вычислите: 1/2 − 9/25; 11/4 − 2/5; 3/4 − 1/5; 1/4 − 3/25; 17/5 − 13/4.

1. \(\frac12-\frac9{25}=\frac{25}{50}-\frac{18}{50}=\frac7{50}\)
2. \(\frac{11}{4}-\frac25=\frac{55}{20}-\frac8{20}=\frac{47}{20}\)
3. \(\frac34-\frac15=\frac{15}{20}-\frac4{20}=\frac{11}{20}\)
4. \(\frac14-\frac3{25}=\frac{25}{100}-\frac{12}{100}=\frac{13}{100}\)
5. \(\frac{17}{5}-\frac{13}{4}=\frac{68}{20}-\frac{65}{20}=\frac3{20}\)

Ответ: 7/50; 47/20; 11/20; 13/100; 3/20.