Question

Giusp mình đi Pls💦

Answer 1

ko bt lm :<<

 

Answer 2

\(\dfrac{x}{z}=\dfrac{z}{y}\Rightarrow xy=z^2\)

\(VT=\dfrac{x^2+z^2}{y^2+z^2}=\dfrac{x^2+xy}{y^2+xy}=\dfrac{x\left(x+y\right)}{y\left(x+y\right)}=\dfrac{x}{y}=VP\)