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

Toán Lớp 9: Rút gọn : $\dfrac{1}{\sqrt{3}-1}-\dfrac{1}{\sqrt{3}+1}$

Toán Lớp 9: Rút gọn :
$\dfrac{1}{\sqrt{3}-1}-\dfrac{1}{\sqrt{3}+1}$

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    1/[\sqrt(3)-1] – 1/[\sqrt(3)+1]
    = [\sqrt(3)+1]/[(\sqrt(3)-1)(\sqrt(3)+1)] – [\sqrt(3)-1]/[(\sqrt(3)-1)(\sqrt(3)+1)]
    = [\sqrt(3)+1-\sqrt(3)+1]/[(\sqrt(3)-1)(\sqrt(3)+1)]
    = 2/[3-1]
    = 2/2
    = 1

  2. Giải đáp:
     =1
    Lời giải và giải thích chi tiết:

    toan-lop-9-rut-gon-dfrac-1-sqrt-3-1-dfrac-1-sqrt-3-1

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