Tìm x :

\(\dfrac{2}{3x}-\dfrac{3}{12}=\dfrac{4}{5}-(\dfrac{7}{x}-2)\)

\(\dfrac{x}{2}-(\dfrac{3x}{5}-\dfrac{13}{5})=(\dfrac{7}{5}+\dfrac{7}{10}x)\)

Tính :

-66 . \((\dfrac{1}{2} - \dfrac{1}{3}+\dfrac{1}{11})\) + 124 . ( -37 ) + 63 . ( -124 )

Tính :

\(\dfrac{1}{10}+\dfrac{1}{40}+\dfrac{1}{88}+\dfrac{1}{154}+\dfrac{1}{238}+\dfrac{1}{340}\)

Tính :

\(\dfrac{0,125-\dfrac{1}{5}+\dfrac{1}{7}}{0,375-\dfrac{3}{5}+\dfrac{3}{7}}\) + \(\dfrac{\dfrac{1}{2}+\dfrac{1}{3}-0,2}{\dfrac{3}{4}+ 0,5 -\dfrac{3}{10}}\)

Tính

\(\dfrac{7}{4}.(\dfrac{33}{12}+\dfrac{3333}{2020}+\dfrac{333333}{303030}+\dfrac{33333333}{42424242})\)