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thupham22011998

[TEX]a,5\sqrt{\frac{1}{5}}+\frac{1}{2}.\sqrt{20}+\sqrt{5}[/TEX]

[TEX]=\sqrt{5}+\sqrt{5}+\sqrt{5}=3\sqrt{5}[/TEX]

[TEX]b,=\sqrt{\frac{1}{2}}+\sqrt{\frac{45}{10}}+\sqrt{125/10}[/TEX]

[TEX]=\sqrt{\frac{1}{2}}+\sqrt{\frac{9}{2}}+\sqrt{\frac{25}{2}}[/TEX]
[TEX]=\frac{9}{\sqrt{2}}=\frac{9\sqrt{2}}{2}[/TEX]
 
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