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

Toán Lớp 9: căn 5+2căn6 – căn5 – 2căn6 giúp mình vớiii

Toán Lớp 9: căn 5+2căn6 – căn5 – 2căn6
giúp mình vớiii

Comments ( 2 )

  1. sqrt{5+2sqrt{6}}-sqrt{5-2sqrt{6}}
    =sqrt{3+2sqrt{6}+2}-sqrt{3-2sqrt{6}+2}
    =sqrt{(sqrt{3}+sqrt{2})^2}-sqrt{(sqrt{3}+sqrt{2})^2}
    =|sqrt{3}+sqrt{2}|-|sqrt{3}-sqrt{2}|
    =sqrt{3}+sqrt{2}-sqrt{3}+sqrt{2}
    =2sqrt{2}.

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