Question

Помогите пожалуйста

Answer 1

Ответ:

1)в

$\frac{3}{20} + \frac{6}{25} = \frac{15}{100} + \frac{24}{100} = \frac{39}{100}$

2)с

$\frac{19}{24} - \frac{4}{15} = \frac{19 \times 5}{120} - \frac{4 \times 8}{120} = \\ = \frac{95}{120} - \frac{32}{120} = \frac{63}{120} = \frac{21}{40}$

3)в

$\frac{1}{12} + \frac{7}{30} = \frac{5}{60} + \frac{14}{60} = \frac{19}{60}$

4)а

$\frac{7}{10} - \frac{1}{15} = \frac{21}{30} - \frac{2}{30} = \frac{19}{30}$

5)в

$\frac{3}{24} + \frac{5}{36} = \frac{9}{72} + \frac{10}{72} = \frac{19}{72}$

6)а

$\frac{7}{12} - \frac{3}{8} = \frac{14}{24} - \frac{9}{24} = \frac{5}{24}$

7)а

$\frac{9}{14} - \frac{2}{21} = \frac{27}{42} - \frac{4}{42} = \frac{23}{42}$

8)с

$\frac{9}{35} + \frac{11}{28} = \frac{36}{140} + \frac{55}{140} = \frac{91}{140}$

9)в

$\frac{11}{32} + \frac{13}{48} = \frac{33}{96} + \frac{26}{96} = \frac{59}{96}$