Giá trị của biểu thức \(-\Big|\dfrac{-2}{5}\Big|+\Big|\dfrac{2}{5}\Big|-\Big(\dfrac{-3}{7}\Big)\) là:
\(\dfrac{2}{5}.\)\(\dfrac{-2}{5}.\)\(\dfrac{3}{7}.\)\(\dfrac{-3}{7}.\)Hướng dẫn giải:\(-\Big|\dfrac{-2}{5}\Big|+\Big|\dfrac{2}{5}\Big|-\Big(\dfrac{-3}{7}\Big)\)
\(=\dfrac{-2}{5}+\dfrac{2}{5}+\dfrac{3}{7}\)
\(=\dfrac{3}{7}.\)
