Tính giá trị biểu thức \(\dfrac{5}{23}.\Big[\Big(-\dfrac{8}{6}\Big)-\dfrac{45}{18}\Big]\).
\(\dfrac{5}{7}.\)\(\dfrac{-5}{6}.\)\(\dfrac{4}{9}.\)\(\dfrac{7}{2}.\)Hướng dẫn giải:\(\dfrac{5}{23}.\Big[\Big(-\dfrac{8}{6}\Big)-\dfrac{45}{18}\Big]\)
\(=\dfrac{5}{23}.\Big[\dfrac{-8}{6}-\dfrac{45}{18}\Big]\)
\(=\dfrac{5}{23}.\dfrac{-23}{6}\)
\(=\dfrac{-5}{6}\)
