Question

qquy đồng mẫu số các phân số

-12/30 và 18/-40

giúp mik với

Answer 1

\(\dfrac{-12}{30}=\dfrac{-12\times4}{30\times4}=\dfrac{-48}{120}\)

\(\dfrac{18}{-40}=\dfrac{-18}{40}=\dfrac{-18\times3}{40\times3}=\dfrac{-54}{120}\)

Answer 2

\(\dfrac{-12}{30}\) = \(\dfrac{-2}{5}\) = \(\dfrac{-2.4}{5.4}\) = \(\dfrac{-8}{20}\) 

\(\dfrac{18}{-40}\) = \(\dfrac{-9}{20}\) 

Answer 3

\(MSC:20\)

\(\dfrac{-12}{30}=\dfrac{-2}{5}=\dfrac{\left(-2\right).4}{5.4}=\dfrac{-8}{20}\)

\(\dfrac{18}{-40}=\dfrac{-9}{20}\)