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sửa đề: \(\dfrac{4}{20}+\dfrac{16}{42}+\dfrac{6}{15}-\dfrac{3}{5}+\dfrac{2}{21}-\dfrac{10}{21}+\dfrac{3}{20}+\dfrac{42}{46}+\dfrac{250}{186}-\dfrac{2121}{2323}-\dfrac{125125}{143143}\)
\(\dfrac{4}{20}+\dfrac{16}{42}+\dfrac{6}{15}-\dfrac{3}{5}+\dfrac{2}{21}-\dfrac{10}{21}+\dfrac{3}{20}+\dfrac{42}{46}+\dfrac{250}{186}-\dfrac{2121}{2323}+\dfrac{125125}{143143}\\ =\dfrac{1}{5}+\dfrac{8}{21}+\dfrac{2}{5}-\dfrac{3}{5}+\dfrac{2}{21}-\dfrac{10}{21}+\dfrac{3}{20}+\dfrac{21}{23}+\dfrac{250}{186}-\dfrac{21}{23}+\dfrac{250}{286}\)\(=\left(\dfrac{1}{5}+\dfrac{2}{5}-\dfrac{3}{5}\right)+\left(\dfrac{8}{21}+\dfrac{2}{21}-\dfrac{10}{21}\right)+\left(\dfrac{21}{23}-\dfrac{21}{23}\right)+\left(\dfrac{250}{186}-\dfrac{250}{186}\right)+\dfrac{3}{20}\\ =\dfrac{3}{20}\)