ГДЗ Математика 6 клас Істер — Вправа 247

Розв'язання

1) $\frac{2}{9} + \frac{3}{5} = \frac{10}{45} + \frac{27}{45} = \frac{37}{45};$

2) $\frac{4}{9} + \frac{1}{6} = \frac{8}{18} + \frac{3}{18} = \frac{11}{18};$

3) $\frac{1}{18} + \frac{5}{12} = \frac{2}{36} + \frac{15}{36} = \frac{17}{36};$

4) $\frac{3}{10} + \frac{2}{15} = \frac{9}{30} + \frac{4}{30} = \frac{13}{30};$

5) $\frac{6}{7} - \frac{2}{3} = \frac{18}{21} - \frac{14}{21} = \frac{4}{21};$

6) $\frac{11}{12} - \frac{5}{6} = \frac{11}{12} - \frac{10}{12} = \frac{1}{12};$

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

8) $\frac{9}{14} - \frac{17}{35} = \frac{45}{70} - \frac{34}{70} = \frac{11}{70}.$