Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 9: Tính: $\sqrt{36-12\sqrt{5}}$ : $\sqrt{6}$ $\sqrt{3-\sqrt{5}}$ : $\sqrt{2}$

Toán Lớp 9: Tính:
$\sqrt{36-12\sqrt{5}}$ : $\sqrt{6}$
$\sqrt{3-\sqrt{5}}$ : $\sqrt{2}$

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    \sqrt{36-12\sqrt{5}}:\sqrt{6}
    =\sqrt{30-2.\sqrt{6}.\sqrt{30}+6}:\sqrt{6}
    =\sqrt{(\sqrt{30}-\sqrt{6})^2} :\sqrt{6}
    =|\sqrt{30}-\sqrt{6}|:\sqrt{6}
    =(\sqrt{30}-\sqrt{6}):\sqrt{6}
    =\sqrt{5}-1
    \sqrt{3-\sqrt{5}}:\sqrt{2}
    =\frac{\sqrt{6-2\sqrt{5}}}{2}
    =\frac{\sqrt{(\sqrt{5}-1)^2}}{2}
    =\frac{\sqrt{5}-1}{2} 

  2. $\sqrt[]{36-12\sqrt[]{5}}:\sqrt[]{6}$
    $=\sqrt[]{\dfrac{36-12\sqrt[]{5}}{6}}$
    $=\sqrt[]{6-2\sqrt[]{5}}$
    $=\sqrt[]{(\sqrt[]{5})^2-2.\sqrt[]{5}.1+1^2}$
    $=\sqrt[]{(\sqrt[]{5}-1)^2}$
    $=|\sqrt[]{5}-1|$
    $=\sqrt[]{5}-1$
    $\sqrt[]{3-\sqrt[]{5}}:\sqrt[]{2}$
    $=\sqrt[]{\dfrac{3-\sqrt[]{5}}{2}}$
    $=\sqrt[]{\dfrac{6-2\sqrt[]{5}}{4}}$
    $=\sqrt[]{6-2\sqrt[]{5}}:\sqrt[]{4}$
    $=\dfrac{\sqrt[]{5}-1}{2}$

Leave a reply

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