Question

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Answer 1

Находим НОЗ у дробей и решаем первое действие в скобках:

1. 1) $(\frac{7}{15} - \frac{1}{6}) = \frac{14}{30} - \frac{5}{30} = \frac{9}{30}$

2) $\frac{9}{30} + \frac{2}{5} = \frac{9}{30} + \frac{12}{30} = \frac{21}{30}$  

2. 1) $\frac{3}{8} - \frac{1}{9} = \frac{27}{72} - \frac{8}{72} = \frac{19}{72}$

2) $\frac{19}{72} + \frac{50}{72} = \frac{69}{72}$

3. 1) $\frac{8}{9} - \frac{5}{6} = \frac{16}{18} - \frac{15}{18} = \frac{1}{18}$

2) $\frac{1}{18} + \frac{2}{3} = \frac{1}{18} + \frac{12}{18} = \frac{13}{18}$

4. 1) $\frac{7}{8} - \frac{13}{20} = \frac{35}{40} - \frac{26}{40} = \frac{9}{40}$

2) $\frac{9}{40} + \frac{9}{10} = \frac{9}{40} + \frac{36}{40} = \frac{45}{40} = 1,125$

5. 1) $\frac{7}{18} - \frac{1}{12} = \frac{14}{36} - \frac{3}{36} = \frac{11}{36}$

2) $\frac{11}{36} + \frac{5}{6} = \frac{11}{36} + \frac{30}{36} = \frac{41}{36} = 1\frac{5}{36}$

6. 1) $\frac{3}{4} - \frac{8}{15} = \frac{45}{60} - \frac{32}{60} = \frac{13}{60}$

2) $\frac{13}{60} + \frac{17}{20} = \frac{13}{60} + \frac{51}{60} = \frac{64}{60} = 1\frac{4}{60}$