Вопрос:
2) Выполните действия с дробями: 1) \(\frac{4}{7}+\frac{1}{7}\); 2) \(\frac{5}{9}-\frac{2}{9}\); 3) \(\frac{6}{8}+\frac{2}{8}\); 4) \(\frac{9}{10}-\frac{3}{12}\); 5) \(\frac{4}{15}+\frac{6}{15}\); 6) \(\frac{13}{35}+\frac{2}{35}\).
Ответ:
- \(\frac{4}{7}+\frac{1}{7}=\frac{5}{7}\);
- \(\frac{5}{9}-\frac{2}{9}=\frac{3}{9}=\frac{1}{3}\);
- \(\frac{6}{8}+\frac{2}{8}=\frac{8}{8}=1\);
- \(\frac{9}{10}-\frac{3}{12}=\frac{9}{10}-\frac{1}{4}=\frac{18}{20}-\frac{5}{20}=\frac{13}{20}\);
- \(\frac{4}{15}+\frac{6}{15}=\frac{10}{15}=\frac{2}{3}\);
- \(\frac{13}{35}+\frac{2}{35}=\frac{15}{35}=\frac{3}{7}\).
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