1) 1/25 + 15/4 =; 2) 9/4 + 8/5 =; 3) 9/25 + 1/4 =; 4) 14/25 + 3/2 =; 5) 3/2 − 9/5 =; 6) 79/2 − 7/25 =

1. \(\frac{1}{25}+\frac{15}{4}=\frac{4+375}{100}=\frac{379}{100}=3.79\).
2. \(\frac{9}{4}+\frac{8}{5}=\frac{45+32}{20}=\frac{77}{20}=3\frac{17}{20}\).
3. \(\frac{9}{25}+\frac{1}{4}=\frac{36+25}{100}=\frac{61}{100}=0.61\).
4. \(\frac{14}{25}+\frac{3}{2}=\frac{28+75}{50}=\frac{103}{50}=2.06\).
5. \(\frac{3}{2}-\frac{9}{5}=\frac{15-18}{10}=-\frac{3}{10}=-0.3\).
6. \(\frac{79}{2}-\frac{7}{25}=\frac{1975-14}{50}=\frac{1961}{50}=39.22\).

Ответ: 1) 3.79; 2) 3 17/20; 3) 0.61; 4) 2.06; 5) −0.3; 6) 39.22.