Ответ:
- \(\frac{11}{25}+\frac4{10}=\frac{22}{50}+\frac{20}{50}=\frac{42}{50}=\frac{21}{25}\).
- \(\frac7{34}+\frac1{17}=\frac7{34}+\frac2{34}=\frac9{34}\).
- \(\frac{13}{20}+\frac{17}{30}=\frac{39}{60}+\frac{34}{60}=\frac{73}{60}=1\frac{13}{60}\).
- \(\frac{15}{28}+\frac{25}{42}=\frac{45}{84}+\frac{50}{84}=\frac{95}{84}=1\frac{11}{84}\).
Ответ: а) \(\frac{21}{25}\); б) \(\frac9{34}\); в) \(1\frac{13}{60}\); г) \(1\frac{11}{84}\).
