Вариант 2 1) $$5 \frac{2}{6} + \frac{7}{7}$$; 2) $$\frac{11}{25} - \frac{8}{10}$$; 3) $$15 \frac{3}{16} - \frac{4}{4}$$; 4) $$\frac{3}{20} + \frac{7}{15}$$; 5) $$\frac{13}{16} - \frac{7}{12}$$; 6) $$\frac{9}{14} + \frac{5}{21}$$;

Решим примеры: 1) $$5 \frac{2}{6} + \frac{7}{7} = 5 \frac{1}{3} + 1 = 5 \frac{1}{3} + \frac{3}{3} = 6 \frac{1+0}{3} = 6 \frac{1}{3}$$ 2) $$\frac{11}{25} - \frac{8}{10} = \frac{11}{25} - \frac{4}{5} = \frac{11}{25} - \frac{20}{25} = - \frac{9}{25}$$ 3) $$15 \frac{3}{16} - \frac{4}{4} = 15 \frac{3}{16} - 1 = 14 \frac{3}{16}$$ 4) $$\frac{3}{20} + \frac{7}{15} = \frac{3 \cdot 3}{20 \cdot 3} + \frac{7 \cdot 4}{15 \cdot 4} = \frac{9}{60} + \frac{28}{60} = \frac{37}{60}$$ 5) $$\frac{13}{16} - \frac{7}{12} = \frac{13 \cdot 3}{16 \cdot 3} - \frac{7 \cdot 4}{12 \cdot 4} = \frac{39}{48} - \frac{28}{48} = \frac{11}{48}$$ 6) $$\frac{9}{14} + \frac{5}{21} = \frac{9 \cdot 3}{14 \cdot 3} + \frac{5 \cdot 2}{21 \cdot 2} = \frac{27}{42} + \frac{10}{42} = \frac{37}{42}$$