\(O=\dfrac{\dfrac{5}{8}+1-\dfrac{5}{3}}{\dfrac{3}{8}+\dfrac{3}{5}-1}-\dfrac{\dfrac{1}{3}-0,25+0,2}{1\dfrac{1}{6}-0,875+0,7}\)
\(O=\dfrac{\dfrac{5}{8}+1-\dfrac{5}{3}}{\dfrac{3}{8}+\dfrac{3}{5}-1}-\dfrac{\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}}{1\dfrac{1}{6}-\dfrac{7}{8}+\dfrac{7}{10}}\)
\(O=\dfrac{\dfrac{5}{8}+1-\dfrac{5}{3}}{\dfrac{3}{8}+\dfrac{3}{5}-1}-\dfrac{\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}}{\dfrac{7}{6}-\dfrac{7}{8}+\dfrac{7}{10}}\)
\(O=\dfrac{\dfrac{15}{24}+\dfrac{24}{24}-\dfrac{40}{24}}{\dfrac{15}{40}+\dfrac{24}{40}-\dfrac{40}{40}}-\dfrac{\dfrac{20}{60}-\dfrac{15}{60}+\dfrac{12}{60}}{\dfrac{7}{6}-\dfrac{7}{8}+\dfrac{7}{10}}\)
\(O=\dfrac{\dfrac{15}{24}+\dfrac{24}{24}-\dfrac{40}{24}}{\dfrac{15}{40}+\dfrac{24}{40}-\dfrac{40}{40}}-\dfrac{\dfrac{20}{60}-\dfrac{15}{60}+\dfrac{12}{60}}{\dfrac{140}{120}-\dfrac{105}{120}+\dfrac{84}{120}}\)
\(O=\dfrac{\dfrac{41}{40}}{-\dfrac{1}{40}}-\dfrac{\dfrac{17}{60}}{\dfrac{119}{120}}\)
\(O=\dfrac{5}{3}-\dfrac{2}{7}\)
\(O=\dfrac{29}{21}\)
Vậy `O=29/21`
