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

Toán Lớp 9: Rút gọn : $\frac{24-9\sqrt{3}}{3-\sqrt{3}}$

Toán Lớp 9: Rút gọn :
$\frac{24-9\sqrt{3}}{3-\sqrt{3}}$

Comments ( 2 )

  1. Bạn tham khảo nhé.
    $\\$
    \frac{24-9\sqrt{3}}{3-\sqrt{3}}
    =\frac{(24-9\sqrt{3})(3+\sqrt{3})}{(3-\sqrt{3})(3+\sqrt{3})}
    =\frac{72+24\sqrt{3}-27\sqrt{3}-27}{9-3}
    =\frac{45-3\sqrt{3}}{6}
    =\frac{3(15-\sqrt{3})}{3.2}
    =\frac{15-\sqrt{3}}{2}
     

  2. Giải đáp:
    $\displaystyle \frac{15-\sqrt{3}}{2}$
    Lời giải và giải thích chi tiết:
    $\displaystyle \begin{array}{{>{\displaystyle}l}} \frac{24-9\sqrt{3}}{3-\sqrt{3}} =\frac{\left( 24-9\sqrt{3}\right)\left( 3+\sqrt{3}\right)}{\left( 3-\sqrt{3}\right)\left( 3+\sqrt{3}\right)}\\ =\frac{24.3-27\sqrt{3} +24\sqrt{3} -27}{3^{2} -\left(\sqrt{3}\right)^{2}}\\ =\frac{45-3\sqrt{3}}{9-3} =\frac{3\left( 15-\sqrt{3}\right)}{6}\\ =\frac{15-\sqrt{3}}{2} \end{array}$

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

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