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ĐKXĐ:$a>0;a$ khác $1$
$P=\dfrac{2a+4\sqrt{a}-6}{\sqrt{a}+3}:$ $\dfrac{2a-2}{\sqrt{a}}$
$P=\dfrac{2(a+2\sqrt{a}-3)}{\sqrt{a}-3}.$ $\dfrac{\sqrt{a}}{2(a-1)}$
$P=\dfrac{2(\sqrt{a}-1)(\sqrt{a}+3)}{\sqrt{a}+3}.$ $\dfrac{\sqrt{a}}{2(\sqrt{a}-1)(\sqrt{a}+1)}$
$P=\dfrac{\sqrt{a}}{\sqrt{a}+3}$
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