cho P = $\frac{√x}{√x + 3}$ + $\frac{2√x}{√x - 3}$ - $\frac{3x+9}{x-9}$ (x$\geq$ 0, x $\neq$ 9) a, rút họn P b, Tìm GTLN của P c, Tìm GTNN của Q = P+ $\frac{√x + 15}{3}$

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