Respuesta :
[tex] \displaystyle
\frac{x^{r-2}\cdot y^{2s}\cdot z^{3t+1}}{x^{2r}\cdot y^{s-4}\cdot z^{2t-3}}=xyz\\\\
x^{-r-2}y^{s+4} z^{t+4}=xyz\\\\
-r-2=1 \wedge s+4=1 \wedge t+4=1\\
r=-3\wedge s=-3 \wedge t=-3\\\\
r^s\cdot t=(-3)^{-3}\cdot(-3)=(-3)^{-2}=\dfrac{1}{9} [/tex]