1. Выполните действия: a) 11/61 + 18/61; б) 29/49 - 11/49; в) 34/97 + 22/97 + 24/97; г) 32/37 + 15/37 - 19/37; д) 30/43 - 20/43 + 25/43.

1. Выполним действия с обыкновенными дробями:

1. $$\frac{11}{61} + \frac{18}{61} = \frac{11 + 18}{61} = \frac{29}{61}$$
2. $$\frac{29}{49} - \frac{11}{49} = \frac{29 - 11}{49} = \frac{18}{49}$$
3. $$\frac{34}{97} + \frac{22}{97} + \frac{24}{97} = \frac{34 + 22 + 24}{97} = \frac{80}{97}$$
4. $$\frac{32}{37} + \frac{15}{37} - \frac{19}{37} = \frac{32 + 15 - 19}{37} = \frac{47 - 19}{37} = \frac{28}{37}$$
5. $$\frac{30}{43} - \frac{20}{43} + \frac{25}{43} = \frac{30 - 20 + 25}{43} = \frac{10 + 25}{43} = \frac{35}{43}$$

Ответ:

1. $$\frac{11}{61} + \frac{18}{61} = \frac{29}{61}$$
2. $$\frac{29}{49} - \frac{11}{49} = \frac{18}{49}$$
3. $$\frac{34}{97} + \frac{22}{97} + \frac{24}{97} = \frac{80}{97}$$
4. $$\frac{32}{37} + \frac{15}{37} - \frac{19}{37} = \frac{28}{37}$$
5. $$\frac{30}{43} - \frac{20}{43} + \frac{25}{43} = \frac{35}{43}$$