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

Toán Lớp 9: 1/√3+1 + 1/√3-1 – 6√1/3 (Mình cần gấp :<)

Toán Lớp 9: 1/√3+1 + 1/√3-1 – 6√1/3 (Mình cần gấp :<)

Comments ( 1 )

  1. $\dfrac{1}{\sqrt{3}+1}$-$\dfrac{1}{\sqrt{3}-1}$ -$\dfrac{6\sqrt{1}}{3}$
    = $\dfrac{(\sqrt{3}-1)-(\sqrt{3}+1)}{(\sqrt{3}-1)(\sqrt{3}+1)}$  -2
    =$\dfrac{\sqrt{3}-1-\sqrt{3}-1}{2}$  -2
    = $\dfrac{-2}{2}$ -2
    =-1-2
    =-3 

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

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