Question

Cho b2 = ac. Chứng minh: \(\dfrac{a^2+b^2}{b^2+c^2}=\dfrac{a}{c}\)

Answer 1

\(\dfrac{a^2+b^2}{b^2+c^2}=\dfrac{a^2+ac}{ac+c^2}=\dfrac{a\left(a+c\right)}{c\left(a+c\right)}=\dfrac{a}{c}\)