Question

Tính giá trị biểu thức a ) ( -3/4 :2/-3). -5/7 b) -2/-5 : ( 7/-5 : -3/2 )

Answer 1

\(a)\left(-\dfrac{3}{4}\div\dfrac{2}{-3}\right)\times\dfrac{-5}{7}\)

 \(=\dfrac{9}{8}\times\dfrac{-5}{7}\)

\(=\dfrac{-45}{56}\)

\(b)\dfrac{-2}{-5}\div\left(\dfrac{7}{-5}\div\dfrac{-3}{2}\right)\)

\(=\dfrac{2}{5}\div\left(\dfrac{7}{-5}\div\dfrac{-3}{2}\right)\)

\(=\dfrac{2}{5}\div\dfrac{14}{15}\)

\(=\dfrac{3}{7}\)