Вопрос:

1. Вычислите: 1) $$4\frac{13}{17}+5\frac{4}{17}$$; 3) $$1-\frac{16}{21}$$; 5) $$8\frac{4}{9}-3\frac{7}{9}$$; 2) $$3\frac{8}{11}+2\frac{6}{11}$$; 4) $$5-2\frac{3}{8}$$; 6) $$12\frac{19}{44}-6\frac{37}{44}$$

Ответ:

  1. $$4\frac{13}{17}+5\frac{4}{17} = (4+5) + (\frac{13}{17}+\frac{4}{17}) = 9 + \frac{17}{17} = 9 + 1 = 10$$
  2. $$3\frac{8}{11}+2\frac{6}{11}=(3+2)+(\frac{8}{11}+\frac{6}{11})=5+\frac{14}{11}=5+1\frac{3}{11}=6\frac{3}{11}$$
  3. $$1-\frac{16}{21}=\frac{21}{21}-\frac{16}{21}=\frac{5}{21}$$
  4. $$5-2\frac{3}{8}=4\frac{8}{8}-2\frac{3}{8}=(4-2)+(\frac{8}{8}-\frac{3}{8})=2+\frac{5}{8}=2\frac{5}{8}$$
  5. $$8\frac{4}{9}-3\frac{7}{9}=7\frac{13}{9}-3\frac{7}{9}=(7-3)+(\frac{13}{9}-\frac{7}{9})=4+\frac{6}{9}=4\frac{6}{9}=4\frac{2}{3}$$
  6. $$12\frac{19}{44}-6\frac{37}{44}=11\frac{63}{44}-6\frac{37}{44}=(11-6)+(\frac{63}{44}-\frac{37}{44})=5+\frac{26}{44}=5\frac{26}{44}=5\frac{13}{22}$$
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