a: \(\dfrac{x}{27}=-\dfrac{2}{3,6}\)
=>\(x=-\dfrac{2}{3,6}\cdot27=-\dfrac{54}{3,6}=-15\)
b: \(-\dfrac{2}{x}=\dfrac{9}{-12}\)(ĐKXĐ: \(x\ne0\))
=>\(\dfrac{2}{x}=\dfrac{9}{12}=\dfrac{3}{4}\)
=>\(x=4\cdot\dfrac{2}{3}=\dfrac{8}{3}\)
c: ĐKXĐ: \(x\ne0\)
\(\dfrac{2.5}{5}=\dfrac{-4}{x}\)
=>\(-\dfrac{4}{x}=\dfrac{1}{2}\)
=>\(x=-4\cdot\dfrac{2}{1}=-8\)
d: \(\dfrac{3}{8}=\dfrac{x}{32}\)
=>\(x=32\cdot\dfrac{3}{8}=\dfrac{32}{8}\cdot3=4\cdot3=12\)
\(a,x=\dfrac{-2.27}{3,6}=-15\\ b,x=\dfrac{-2.\left(-12\right)}{9}=-\dfrac{8}{3}\\ c,x=\dfrac{\left(-4\right).5}{2,5}=-8\\ d,x=\dfrac{3.32}{8}=12\)
