[Toán 9]Căn thức

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nguyenbahiep1

[laTEX]\sqrt{16-2\sqrt{55}}=\sqrt{a}-\sqrt{b} \\ \\ 16 - 2\sqrt{55} = a+b - 2\sqrt{ab} \\ \\ \begin{cases} a+b = 16 \\ ab = 55 \end{cases} dk: a > b \\ \\ \Rightarrow a = 11 , b= 5[/laTEX]
 
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