Question

Срочно (1,2 : 9/20 - 2 целых 3/8) : 0,7

Answer 1

$displaystylett(1.2:frac{9}{20}-2frac{3}{8}):0.7=Big(frac{12}{10}cdot frac{20}{9}-frac{19}{8}Big):frac{7}{10} =\\\=Big(frac{4cdot2}{3} -frac{19}{8}Big):frac{7}{10}=frac{64-57}{24}cdotfrac{10}{7} =\\\=frac{not7}{24}cdotfrac{10}{not7}=frac{10}{24}=frac{5}{12}$