\(\dfrac{x}{3}=\dfrac{y}{5}=\dfrac{z}{2}\) => \(\dfrac{2x}{6}=\dfrac{y}{5}=\) \(\dfrac{4z}{8}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có
\(\dfrac{2x}{6}\) = \(\dfrac{y}{5}\) = \(\dfrac{4z}{8}\)= \(\dfrac{2x-y+4z}{6-5+8}\) = \(\dfrac{27}{9}\) = 3
\(x\) = 3.6:2= 9
y=3.5 = 15
z = 3.8:4 = 6