Реши пример 1 варианта: 1/2 + 3/5 =

1 Вариант 1) $$\frac{1}{2} + \frac{3}{5} = \frac{5}{10} + \frac{6}{10} = \frac{11}{10} = 1 \frac{1}{10}$$ 2) $$\frac{1}{3} + \frac{4}{9} + \frac{2}{9} = \frac{3}{9} + \frac{4}{9} + \frac{2}{9} = \frac{9}{9} = 1$$ 3) $$\frac{1}{9} + \frac{1}{5} + \frac{1}{3} = \frac{5}{45} + \frac{9}{45} + \frac{15}{45} = \frac{29}{45}$$ 4) $$3 \frac{1}{8} + 7 \frac{5}{8} = 3 + 7 + \frac{1}{8} + \frac{5}{8} = 10 + \frac{6}{8} = 10 \frac{3}{4}$$ 5) $$5 \frac{3}{8} + 7 \frac{5}{12} = 5 + 7 + \frac{3}{8} + \frac{5}{12} = 12 + \frac{9}{24} + \frac{10}{24} = 12 + \frac{19}{24} = 12 \frac{19}{24}$$ 2 Вариант 1) $$\frac{5}{9} + \frac{1}{6} = \frac{10}{18} + \frac{3}{18} = \frac{13}{18}$$ 2) $$\frac{2}{5} + \frac{3}{5} + \frac{2}{10} = \frac{4}{10} + \frac{6}{10} + \frac{2}{10} = \frac{12}{10} = 1 \frac{2}{10} = 1 \frac{1}{5}$$ 3) $$\frac{5}{6} + \frac{3}{8} + \frac{1}{4} = \frac{20}{24} + \frac{9}{24} + \frac{6}{24} = \frac{35}{24} = 1 \frac{11}{24}$$ 4) $$10 \frac{2}{5} + 3 \frac{4}{5} = 10 + 3 + \frac{2}{5} + \frac{4}{5} = 13 + \frac{6}{5} = 13 + 1 \frac{1}{5} = 14 \frac{1}{5}$$ 5) $$15 \frac{7}{18} + 11 \frac{8}{9} = 15 + 11 + \frac{7}{18} + \frac{8}{9} = 26 + \frac{7}{18} + \frac{16}{18} = 26 + \frac{23}{18} = 26 + 1 \frac{5}{18} = 27 \frac{5}{18}$$