Вычислите:
а) $\frac{7}{16} + \frac{1}{4}$;
б) $\frac{25}{36} - \frac{2}{9}$;
в) $\frac{7}{12} - \frac{5}{24}$;
г) $\frac{5}{7} - \frac{11}{21}$;
д) $\frac{1}{6} + \frac{5}{18}$;
е) $\frac{19}{45} + \frac{4}{15}$;
ж) $\frac{15}{16} - \frac{3}{32}$;
з) $\frac{7}{15} + \frac{1}{3}$;
и) $\frac{11}{13} - \frac{20}{39}$;
к) $\frac{3}{50} + \frac{18}{25}$;
л) $\frac{43}{62} - \frac{10}{31}$;
м) $\frac{29}{64} + \frac{3}{8}$.
$\frac{7}{16} + \frac{1}{4} = \frac{7 + 1 * 4}{16} = \frac{7 + 4}{16} = \frac{11}{16}$
$\frac{25}{36} - \frac{2}{9} = \frac{25 - 2 * 4}{36} = \frac{25 - 8}{36} = \frac{17}{36}$
$\frac{7}{12} - \frac{5}{24} = \frac{7 * 2 - 5}{24} = \frac{14 - 5}{24} = \frac{9}{24} = \frac{3}{8}$
$\frac{5}{7} - \frac{11}{21} = \frac{5 * 3 - 11}{21} = \frac{15 - 11}{21} = \frac{4}{21}$
$\frac{1}{6} + \frac{5}{18} = \frac{1 * 3 + 5}{18} = \frac{8}{18} = \frac{4}{9}$
$\frac{19}{45} + \frac{4}{15} = \frac{19 + 4 * 3}{45} = \frac{19 + 12}{45} = \frac{31}{45}$
$\frac{15}{16} - \frac{3}{32} = \frac{15 * 2 - 3}{32} = \frac{30 - 3}{32} = \frac{27}{32}$
$\frac{7}{15} + \frac{1}{3} = \frac{7 + 1 * 5}{15} = \frac{12}{15} = \frac{4}{5}$
$\frac{11}{13} - \frac{20}{39} = \frac{11 * 3 - 20}{39} = \frac{33 - 20}{39} = \frac{13}{39} = \frac{1}{3}$
$\frac{3}{50} + \frac{18}{25} = \frac{3 + 18 * 2}{50} = \frac{3 + 36}{50} = \frac{39}{50}$
$\frac{43}{62} - \frac{10}{31} = \frac{43 - 10 * 2}{62} = \frac{43 - 20}{62} = \frac{23}{62}$
$\frac{29}{64} + \frac{3}{8} = \frac{29 + 3 * 8}{64} = \frac{29 + 24}{64} = \frac{53}{64}$
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