Question

Giúp mình chút phần b, hơi rối xíu

Answer 1

ta có:  \(\dfrac{a}{b}=\dfrac{5}{6}\)

    =>\(\dfrac{a}{b}=\dfrac{5}{6}=\dfrac{a+5}{b+6}=\dfrac{a-5}{b-6}\) 

   =>\(\dfrac{a+5}{b+6}=\dfrac{a-5}{b-6}\)

  =>\(\dfrac{a+5}{a-5}=\dfrac{b+6}{b-6}\)

  Vậy nếu \(\dfrac{a+5}{a-5}=\dfrac{b+6}{b-6}\) thì\(\dfrac{a}{b}=\dfrac{5}{6}\).