Упростить выражения:
а) [tex]( \frac{9y}{x} - \frac{9y}{x+y})*( \frac{x+y}{3y} )^2[/tex]
б) [tex](4x - \frac{12x}{x-2} ): (x- \frac{8x-25}{x-2} )[/tex]
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