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

Toán Lớp 9: Làm giúp mình bài này ạ √(5 – 2√6) – √(8 – 2√15) – √(7 + 2√10) = 2√3

Toán Lớp 9: Làm giúp mình bài này ạ
√(5 – 2√6) – √(8 – 2√15) – √(7 + 2√10) = 2√3

Comments ( 1 )

  1. $\sqrt[]{5-2\sqrt[]{6}}-\sqrt[]{8-2\sqrt[]{15}}-\sqrt[]{7+2\sqrt[]{10}}$ 
    $=\sqrt[]{2-2.\sqrt[]{2}.\sqrt[]{3}+3}-\sqrt[]{5-2.\sqrt[]{5}.\sqrt[]{3}+3}-\sqrt[]{5+2.\sqrt[]{5}.\sqrt[]{2}+2}$
    $=\sqrt[]{(\sqrt[]{2}-\sqrt[]{3})²}-\sqrt[]{(\sqrt[]{5}-\sqrt[]{3})²}-\sqrt[]{(\sqrt[]{5}+\sqrt[]{2})²}$
    $=|\sqrt[]{2}-\sqrt[]{3}|-|\sqrt[]{5}-\sqrt[]{3}|-|\sqrt[]{5}+\sqrt[]{2}|$
    $=\sqrt[]{3}-\sqrt[]{2}+\sqrt[]{3}-\sqrt[]{5}-\sqrt[]{5}-\sqrt[]{2}$
    $=2\sqrt[]{3}-2\sqrt[]{2}-2\sqrt[]{5}$

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

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