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

Toán Lớp 9: CMR : ( căn của (4-2 căn 3)) – căn 3 =-1

Toán Lớp 9: CMR : ( căn của (4-2 căn 3)) – căn 3 =-1

Comments ( 2 )

  1.  \qquad \sqrt{4-2\sqrt{3}}-\sqrt{3}
    =\sqrt{3-2\sqrt{3}+1}-\sqrt{3}
    =\sqrt{(\sqrt{3}-1)^2}-\sqrt{3}
    =|\sqrt{3}-1|-\sqrt{3}
    =\sqrt{3}-1-\sqrt{3}
    =-1 (\text{đpcm})

  2. \qquad sqrt{4-2\sqrt{3}}-\sqrt{3}
    =\sqrt{3-2\sqrt{3}+1}-\sqrt{3}
    =\sqrt{(\sqrt{3}-1)^2}-\sqrt{3}
    =|\sqrt{3}-1|-\sqrt{3}
    =\sqrt{3}-1-\sqrt{3}
    =-1 (\text{tm})
     

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

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