Вопрос:
Вычислите: а) 1/2 + 3/16; б) 2/7 + 3/21; в) 2/9 + 7/27; г) 2/3 + 1/9; д) 5/9 + 1/6; е) 4/7 + 1/6; ж) 7/28 + 3/14; з) 3/8 + 3/5; и) 2/9 + 4/6.
Ответ:
- \(\frac{1}{2}+\frac{3}{16}=\frac{8}{16}+\frac{3}{16}=\frac{11}{16}\).
- \(\frac{2}{7}+\frac{3}{21}=\frac{6}{21}+\frac{3}{21}=\frac{9}{21}=\frac{3}{7}\).
- \(\frac{2}{9}+\frac{7}{27}=\frac{6}{27}+\frac{7}{27}=\frac{13}{27}\).
- \(\frac{2}{3}+\frac{1}{9}=\frac{6}{9}+\frac{1}{9}=\frac{7}{9}\).
- \(\frac{5}{9}+\frac{1}{6}=\frac{10}{18}+\frac{3}{18}=\frac{13}{18}\).
- \(\frac{4}{7}+\frac{1}{6}=\frac{24}{42}+\frac{7}{42}=\frac{31}{42}\).
- \(\frac{7}{28}+\frac{3}{14}=\frac{7}{28}+\frac{6}{28}=\frac{13}{28}\).
- \(\frac{3}{8}+\frac{3}{5}=\frac{15}{40}+\frac{24}{40}=\frac{39}{40}\).
- \(\frac{2}{9}+\frac{4}{6}=\frac{2}{9}+\frac{2}{3}=\frac{2}{9}+\frac{6}{9}=\frac{8}{9}\).