Vì x = y + z => x - z = y; y - x = -z; z - y = -x
=> \(B=\left(1-\frac{z}{x}\right)\left(1-\frac{x}{y}\right)\left(1-\frac{y}{z}\right)=\frac{x-z}{x}\cdot\frac{y-x}{y}\cdot\frac{z-y}{z}=\frac{y}{x}\cdot\left(\frac{-z}{y}\right)\cdot\left(\frac{-x}{z}\right)=1\)