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thuytrangnbk20

S

soccan

$ Q=\dfrac{\sqrt{2}+\sqrt{3}+\sqrt{6}+\sqrt{8}+4}{ \sqrt{2}+\sqrt{3}+\sqrt{4}}\\
=1+\dfrac{\sqrt{6}+\sqrt{8}+2}{\sqrt[]{2}+\sqrt[]{3}+2}\\
=1+\sqrt{2}$
 
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T

transformers123

b/ $\sqrt{14+\sqrt{40}+\sqrt{56}+\sqrt{140}}$

$=\sqrt{2+5+7+2\sqrt{10}+2\sqrt{14}+2\sqrt{35}}$

$=\sqrt{(\sqrt{2}+\sqrt{5}+\sqrt{7})^2}$

$=\sqrt{2}+\sqrt{5}+\sqrt{7}$
 
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