Question

c) - 1/5 / (1 2/5) = - 2/7 / x d) 1 1/2 / (2/3) = x / (1/9) Giúp em với

Answer 1

c: \(-\dfrac{1}{5}:\left(1\dfrac{2}{5}\right)=-\dfrac{2}{7}:x\)

=>\(-\dfrac{2}{7}:x=-\dfrac{1}{5}:\dfrac{7}{5}=\dfrac{-1}{5}\cdot\dfrac{5}{7}=-\dfrac{1}{7}\)

=>\(x=\dfrac{-2}{7}:\dfrac{-1}{7}=\dfrac{2}{7}\cdot\dfrac{7}{1}=2\)

d: \(1\dfrac{1}{2}:\dfrac{2}{3}=x:\dfrac{1}{9}\)

=>\(x:\dfrac{1}{9}=\dfrac{3}{2}\cdot\dfrac{3}{2}=\dfrac{9}{4}\)

=>\(x=\dfrac{9}{4}\cdot\dfrac{1}{9}=\dfrac{1}{4}\)