Answer
$\frac{5x^2}{y^3}$
Work Step by Step
We divide by the monomial as follows:
$$
\frac{85x^4y^2}{17x^2y^5}=\frac{5\cdot 17 x^4y^2}{17x^2y^5}=\frac{5x^2}{y^3}
.$$
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