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Đáp án:

`\frac{4x^{2}}{5y^{2}}:\frac{6x}{5y}:\frac{2x}{3y^{2}}`

$=\dfrac{4x^2}{5y^2}.\dfrac{5y}{6x}.\dfrac{3y^2}{2x}$

$= \dfrac{4x^2.5y.3y^2}{5y^2.6x.2x}$

$= \dfrac{x^2.y.y^2}{y^2.x.x}$

$=\dfrac{x^2.y.y^2}{y^2.x^2}$

 $=\dfrac{x^2y^3}{x^2y^2}$

$=\dfrac{y}{1}$

$=y$