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

Toán Lớp 9: ✓(2-✓7)^2-✓7 Rút gọn biểu thức

Toán Lớp 9: ✓(2-✓7)^2-✓7
Rút gọn biểu thức

Comments ( 2 )

  1. $\sqrt{(2-\sqrt{7})}^2 – \sqrt{7}$
    $=\sqrt{(2-\sqrt{7})}^2 – \sqrt{7}$
    $=2-\sqrt{7} – \sqrt{7}$
    $=2-2\sqrt{7}$
    $=2(1-\sqrt{7})$
    $#thanhmaii2008$

  2. Answer
    \sqrt{(2 – \sqrt{7})^2} – \sqrt{7}
    = |2 – \sqrt{7}| – \sqrt{7}
    = 2 – \sqrt{7} – \sqrt{7}
    = 2 – 2\sqrt{7}

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

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