hòa tan hoàn toàn 9,2 gam Natri vào rượu Etylic thu được V lít khí. Hãy tính V.

hòa tan hoàn toàn 9,2 gam Natri vào rượu Etylic thu được V lít khí. Hãy tính V.

dễ mà

\(\sqrt{9-4\sqrt{5}}-\sqrt{5}=\sqrt{5+4-4\sqrt{5}}-\sqrt{5}=\sqrt{\left(\sqrt{5}-2\right)}^2-\sqrt{5}=\sqrt{5}-2-\sqrt{5}=-2\)

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