2. Сложение и вычитание смешанных чисел с разными знаменателями
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$$9\frac{3}{4} + 3\frac{1}{6} = 9\frac{9}{12} + 3\frac{2}{12} = 12\frac{11}{12}$$
Ответ: $$12\frac{11}{12}$$
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$$7\frac{8}{9} - 2\frac{2}{3} = 7\frac{8}{9} - 2\frac{6}{9} = 5\frac{2}{9}$$
Ответ: $$5\frac{2}{9}$$
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$$11\frac{7}{12} + 6\frac{11}{18} = 11\frac{21}{36} + 6\frac{22}{36} = 17\frac{43}{36} = 18\frac{7}{36}$$
Ответ: $$18\frac{7}{36}$$
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$$5\frac{5}{9} - 2\frac{4}{7} = 5\frac{35}{63} - 2\frac{36}{63} = 4\frac{98}{63} - 2\frac{36}{63} = 2\frac{62}{63}$$
Ответ: $$2\frac{62}{63}$$
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$$9\frac{5}{7} - 2\frac{3}{7} = 7\frac{2}{7}$$
Ответ: $$7\frac{2}{7}$$
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$$7\frac{5}{16} + 4\frac{1}{6} + 3\frac{3}{8} = 7\frac{15}{48} + 4\frac{8}{48} + 3\frac{18}{48} = 14\frac{41}{48}$$
Ответ: $$14\frac{41}{48}$$
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$$8\frac{5}{9} + 7\frac{7}{8} + 12\frac{7}{12} = 8\frac{40}{72} + 7\frac{63}{72} + 12\frac{42}{72} = 27\frac{145}{72} = 29\frac{1}{72}$$
Ответ: $$29\frac{1}{72}$$
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$$6\frac{7}{8} - 3\frac{1}{3} + 5\frac{5}{16} = 6\frac{42}{48} - 3\frac{16}{48} + 5\frac{15}{48} = 8\frac{41}{48}$$
Ответ: $$8\frac{41}{48}$$
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$$5\frac{8}{15} + 4\frac{7}{12} - 3\frac{19}{20} = 5\frac{32}{60} + 4\frac{35}{60} - 3\frac{57}{60} = 6\frac{10}{60} = 6\frac{1}{6}$$
Ответ: $$6\frac{1}{6}$$
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$$5\frac{9}{14} - 2\frac{3}{7} + 6.7 = 5\frac{9}{14} - 2\frac{6}{14} + 6\frac{7}{10} = 3\frac{3}{14} + 6\frac{7}{10} = 3\frac{15}{70} + 6\frac{49}{70} = 9\frac{64}{70} = 9\frac{32}{35}$$
Ответ: $$9\frac{32}{35}$$