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

Toán Lớp 9: đề: thực hiện phép tính. a) $\frac{2}{y}$ $\frac{2}{\sqrt{3-1}}$ $+$ $\frac{2}{\sqrt{3}+1}$

Toán Lớp 9: đề: thực hiện phép tính.
a) $\frac{2}{y}$ $\frac{2}{\sqrt{3-1}}$ $+$ $\frac{2}{\sqrt{3}+1}$

Comments ( 1 )

  1. a)\frac{2}{\sqrt{3}-1}+\frac{2}{\sqrt{3}+1}
    =\frac{2(\sqrt{3}+1)+2(\sqrt{3}-1)}{(\sqrt{3}-1)(\sqrt{3}+1)}
    =\frac{4\sqrt{3}}{2}
    =2\sqrt{3}
    @Nobitao@

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