spam đó

\(24-\dfrac{2}{5}-\dfrac{5}{12}\)

\(=\dfrac{24}{1}-\dfrac{2}{5}-\dfrac{5}{12}\)

\(=\dfrac{120}{5}-\dfrac{2}{5}-\dfrac{5}{12}\)

\(=\dfrac{118}{5}-\dfrac{5}{12}\)

\(=\dfrac{1416}{60}-\dfrac{25}{60}\)

\(=\dfrac{1391}{60}\)

\(x\times7,5=44,625:1,7\)

\(x\times\dfrac{15}{2}=\dfrac{357}{8}:\dfrac{17}{10}\)

\(x\times\dfrac{15}{2}=\dfrac{357}{8}\times\dfrac{10}{17}\)

\(x\times\dfrac{15}{2}=\dfrac{105}{4}\)

\(x=\dfrac{105}{4}:\dfrac{15}{2}\)

\(x=\dfrac{105}{4}\times\dfrac{2}{15}\)

\(x=\dfrac{7}{2}\)

kê

\(1+\dfrac{1}{2}\)

\(=\dfrac{1}{1}+\dfrac{1}{2}\)

\(=\dfrac{2}{2}+\dfrac{1}{2}\)

\(=\dfrac{2+1}{2}\)

\(=\dfrac{3}{2}\)

\(\dfrac{2}{9}\times\dfrac{7}{13}+\left(-\dfrac{11}{9}\right)\times\dfrac{7}{13}+\dfrac{7}{13}\)

\(=\dfrac{7}{13}\times\left(\dfrac{2}{9}+\dfrac{-11}{9}+1\right)\)

\(=\dfrac{7}{13}\times0\)

\(=0\)