[Toán 9] bt căn khó

N

nguyenbahiep1

1.
[TEX] 2\sqrt{\frac{16}{3}} - 3\sqrt{\frac{1}{27}} - 6\sqrt{\frac{4}{75}} [/TEX]
2.
[TEX] \sqrt{\frac{2-\sqrt{3}}{2+\sqrt{3}}+ \sqrt{\frac{2+\sqrt{3}}{2-\sqrt{3}}[/TEX]

câu 1

[laTEX]\frac{8}{\sqrt{3}} - \frac{1}{\sqrt{3}} - \frac{12}{5.\sqrt{3}} \\ \\ \frac{23}{5.\sqrt{3}} = \frac{23\sqrt{3}}{5}[/laTEX]

câu 2 nhân liên hợp

[laTEX]\sqrt{(2-\sqrt{3})^2 + (2+\sqrt{3}) } = \sqrt{9-3\sqrt{3}}[/laTEX]
 
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