Question

tính: : (-2)³ . \(\left(\dfrac{3}{4}-0,25\right):\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

Answer 1

\(\left(-2\right)^3.\left(\dfrac{3}{4}-0,25\right):\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

\(=-8.\left(\dfrac{3}{4}-\dfrac{1}{4}\right):\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

\(=-8.\dfrac{3-1}{4}:\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

\(=-8.\dfrac{2}{4}:\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

\(=-8.\dfrac{1}{2}:\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

\(=-4:\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)

\(=-4:\left(\dfrac{9}{4}-\dfrac{7}{6}\right)\)

\(=-4:\left(\dfrac{27}{12}-\dfrac{14}{12}\right)\)

\(=-4:\dfrac{27-14}{12}\)

\(=-4:\dfrac{13}{12}\)

\(=-4.\dfrac{12}{13}\)

\(=\dfrac{-48}{13}\)