Question

Номер420!!!
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Answer 1

$1-\frac{8}{15}=\frac{7}{15}\\\\3-\frac{2}{11}=2\frac{9}{11}\\\\4-3\frac{4}{9}=\frac{5}{9}\\\\7\frac{3}{8}-5=2\frac{3}{8}\\\\45-44\frac{3}{8}=\frac{5}{8}\\\\6\frac{7}{15}-3\frac{1}{5}=3\frac{7-3}{15}=3\frac{4}{15}\\\\10\frac{3}{23}-7\frac{19}{46}=3\frac{6}{46}-\frac{19}{46}=2\frac{46+6-19}{46}=2\frac{33}{46}\\\\16\frac{2}{5}-4\frac{3}{7}=16\frac{2*7}{5*7}-4\frac{3*5}{7*5}=16\frac{14}{35}-4\frac{15}{35}=11\frac{34}{35}$

$19\frac{5}{12}-8\frac{17}{18}=19\frac{5*18}{12*18}-8\frac{17*12}{18*12}=19\frac{90}{216}-8\frac{204}{216}=18\frac{216+90}{216}-8\frac{204}{216}=10\frac{102}{216}=10\frac{17}{36}.$