Ответ:
- \(\frac78-\frac12=\frac78-\frac48=\frac38\).
- \(5-2\frac23=\frac{15}{3}-\frac83=\frac73=2\frac13\).
- \(3\frac35+3\frac{11}{15}=\frac{54}{15}+\frac{56}{15}=\frac{110}{15}=7\frac13\).
- \(9\frac{11}{42}-5\frac{11}{14}=8\frac{53}{42}-5\frac{33}{42}=3\frac{20}{42}=3\frac{10}{21}\).
- \(\frac47\times\frac32=\frac67\).
- \(2\frac45\times15=\frac{14}{5}\times15=42\).
- \(\frac{25}{27}:\frac59=\frac{25}{27}\times\frac95=\frac53=1\frac23\).
- \(4\frac15:1\frac14=\frac{21}{5}:\frac54=\frac{21}{5}\times\frac45=\frac{84}{25}=3\frac9{25}\).
Ответ: 1) \(\frac38\); 2) \(2\frac13\); 3) \(7\frac13\); 4) \(3\frac{10}{21}\); 5) \(\frac67\); 6) \(42\); 7) \(1\frac23\); 8) \(3\frac9{25}\).
