Контрольные задания > 11) $$3\frac{2}{3}+1,4=$$ 12) $$1\frac{4}{7}-1,3 =$$ 13) $$9,2-5\frac{2}{3} =$$ 14) $$1,5+7\frac{4}{9} =$$ 15) $$3,3+4\frac{5}{6} =$$
Вопрос:

11) $$3\frac{2}{3}+1,4=$$ 12) $$1\frac{4}{7}-1,3 =$$ 13) $$9,2-5\frac{2}{3} =$$ 14) $$1,5+7\frac{4}{9} =$$ 15) $$3,3+4\frac{5}{6} =$$

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Ответ:

  1. $$3\frac{2}{3}+1,4=3\frac{2}{3}+1\frac{4}{10}=3\frac{2}{3}+1\frac{2}{5}=3\frac{10}{15}+1\frac{6}{15}=4\frac{16}{15}=5\frac{1}{15}$$
  2. $$1\frac{4}{7}-1,3 = 1\frac{4}{7} - 1\frac{3}{10} = 1\frac{40}{70} - 1\frac{21}{70} = \frac{19}{70}$$
  3. $$9,2-5\frac{2}{3} = 9\frac{2}{10} - 5\frac{2}{3} = 9\frac{1}{5} - 5\frac{2}{3} = 9\frac{3}{15} - 5\frac{10}{15} = 8\frac{18}{15} - 5\frac{10}{15} = 3\frac{8}{15}$$
  4. $$1,5+7\frac{4}{9} = 1\frac{5}{10} + 7\frac{4}{9} = 1\frac{1}{2} + 7\frac{4}{9} = 1\frac{9}{18} + 7\frac{8}{18} = 8\frac{17}{18}$$
  5. $$3,3+4\frac{5}{6} = 3\frac{3}{10} + 4\frac{5}{6} = 3\frac{9}{30} + 4\frac{25}{30} = 7\frac{34}{30} = 8\frac{4}{30} = 8\frac{2}{15}$$
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