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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: tính √( 7 – √6 ) – √( 7 + √6 )

Toán Lớp 9: tính √( 7 – √6 ) – √( 7 + √6 )

Comments ( 2 )

  1. $\displaystyle \begin{array}{{>{\displaystyle}l}} \sqrt{7-\sqrt{6}} -\sqrt{7+\sqrt{6} \ } =A\\ A^{2} =7-\sqrt{6} +7+\sqrt{6} +2\sqrt{\left( 7-\sqrt{6}\right)\left( 7+\sqrt{6}\right)} \ \\ A^{2} =14+2\sqrt{43} \ \\ \rightarrow A=\sqrt{14+2\sqrt{43}}\\ \\ \\ \end{array}$

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222-9+11+12:2*14+14 = ? ( )

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