L
lilipad


Rút gọn:
$H=\frac{a^2-\sqrt{a}}{a +\sqrt{a}+1}-\frac{a^2 +\sqrt{a}}{a-\sqrt{a}+1}+a+1$
$H=\frac{a^2-\sqrt{a}}{a +\sqrt{a}+1}-\frac{a^2 +\sqrt{a}}{a-\sqrt{a}+1}+a+1$
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