Thu gọn biểu thức

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huyentrantran

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soicon_boy_9x

$A=\dfrac{2(\sqrt{5}-2)}{\sqrt{5}-2}-\dfrac{1}{2-\sqrt{3}}=\dfrac{3-2\sqrt{3}}{2-\sqrt{3}}=\dfrac{\sqrt{3}(\sqrt{3}-2)}{2-\sqrt{3}}=-\sqrt{3}$

$B=(\dfrac{a-4\sqrt{a}+4-a-4\sqrt{a}-4}{a-4}.\dfrac{a-4}{\sqrt{a}}=\dfrac{-8\sqrt{a}}{a-4}.\dfrac{a-4}{\sqrt{a}}=-8$

 
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