Question

помогитееее пожалуйста

Answer 1

$18 frac{61}{92} - 4 frac{13}{46} + 12 frac{9}{23} = \ = (18 - 4 + 12) + \ + ( frac{61}{92} - frac{26}{92} + frac{36}{92} ) = \ = 26 frac{71}{92}$
$frac{10}{21} div frac{5}{6} - frac{2}{9} times frac{3}{4} = \ = frac{10 times 6}{21 times 5} - frac{2 times 3}{9 times 4} = \ = frac{2 times 2}{7 times 1} - frac{1 times 1}{3 times 2} = frac{4}{7} - frac{1}{6} = \ = frac{24 - 7}{42} = frac{17}{42}$
$(2 - frac{7}{10} ) div ( frac{5}{7} + frac{3}{14} ) = \ = frac{20 - 7}{10} div frac{2 times 5 + 3}{14} = \ = frac{13}{10} times frac{14}{13} = frac{7}{5} = 1 frac{2}{5}$