2. Вычислите: а) 4/25 + 15/25; б) 9/4 − 8/5; в) 14/25 + 3/2; г) (1/6 + 1/4) · 9; д) 3 · (3/4 − 1/6); е) (2/5 + 13/15) · 6.

1. \(\frac4{25}+\frac{15}{25}=\frac{19}{25}\).
2. \(\frac94-\frac85=\frac{45}{20}-\frac{32}{20}=\frac{13}{20}\).
3. \(\frac{14}{25}+\frac32=\frac{28}{50}+\frac{75}{50}=\frac{103}{50}=2\frac3{50}\).
4. \(\left(\frac16+\frac14\right)\cdot9=\left(\frac2{12}+\frac3{12}\right)\cdot9=\frac5{12}\cdot9=\frac{15}{4}=3\frac34\).
5. \(3\cdot\left(\frac34-\frac16\right)=3\cdot\frac7{12}=\frac74=1\frac34\).
6. \(\left(\frac25+\frac{13}{15}\right)\cdot6=\left(\frac6{15}+\frac{13}{15}\right)\cdot6=\frac{19}{15}\cdot6=\frac{38}{5}=7\frac35\).

Ответ: а) 19/25; б) 13/20; в) 2 3/50; г) 3 3/4; д) 1 3/4; е) 7 3/5.