Question

mn giúp mik vs!!!

Tìm a, b biết: \(\dfrac{a}{27}=\dfrac{-5}{9}=\dfrac{-45}{b}\)

 

Answer 1

\(\dfrac{-5}{9}\)=\(\dfrac{-45}{b}\)

⇒ b= [9. (-45)] : -5

⇒ b= -405       : -5

⇒ b= 81

⇒ \(\dfrac{-45}{81}\)

 

\(\dfrac{a}{27}\)= \(\dfrac{-5}{9}\) 

⇒ a= [ 27 .(-5) ] : 9

⇒ a= -135         : 9

⇒ a= -15

⇒ \(\dfrac{-15}{27}\)

⇒ \(\dfrac{-15}{27}\)=\(\dfrac{-5}{9}\)=\(\dfrac{-45}{81}\)

Answer 2

\(\dfrac{a}{27}=\dfrac{-5}{9}=\dfrac{-45}{b}\) 

⇒\(a=\dfrac{-5.27}{9}=-15\) 

⇒\(b=\dfrac{-45.9}{5}=-81\)