21. Выполните сложение и вычитание и выделите целую часть дроби: 11/12 + 9/12; 7/13 − 7/13; 23/7 − 13/7; 17/10 + 7/10; 48/36 − 12/36; 119/36 − 11/36; 677/66 − 13/66; 45/15 + 7/15; 50/7 − 16/7; 19/18 + 15/18.

Question

Вопрос:

Accepted Answer

\(\frac{11}{12}+\frac{9}{12}=\frac{20}{12}=1\frac{8}{12}=1\frac{2}{3}\).
\(\frac{7}{13}-\frac{7}{13}=0\).
\(\frac{23}{7}-\frac{13}{7}=\frac{10}{7}=1\frac{3}{7}\).
\(\frac{17}{10}+\frac{7}{10}=\frac{24}{10}=2\frac{4}{10}=2\frac{2}{5}\).
\(\frac{48}{36}-\frac{12}{36}=\frac{36}{36}=1\).
\(\frac{119}{36}-\frac{11}{36}=\frac{108}{36}=3\).
\(\frac{677}{66}-\frac{13}{66}=\frac{664}{66}=10\frac{4}{66}=10\frac{2}{33}\).
\(\frac{45}{15}+\frac{7}{15}=\frac{52}{15}=3\frac{7}{15}\).
\(\frac{50}{7}-\frac{16}{7}=\frac{34}{7}=4\frac{6}{7}\).
\(\frac{19}{18}+\frac{15}{18}=\frac{34}{18}=1\frac{16}{18}=1\frac{8}{9}\).

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