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

Toán Lớp 9: Chứng minh ( √3 – 1) ² = 4 -2 √3

Toán Lớp 9: Chứng minh ( √3 – 1) ² = 4 -2 √3

Comments ( 2 )

  1. Ta có:
    VT=(\sqrt{3}-1)^2
         =(\sqrt{3})^3-2.\sqrt{3}.1+1^2
         =3-2\sqrt{3}+1
         =4-2\sqrt{3}=VP
    Vậy (\sqrt{3}-1)^2=4-2\sqrt{3} (ĐPCM)
     

  2. (\sqrt{3}-1)²
    =(\sqrt{3})² – 2.\sqrt{3}.1 + 1²
    =3-2\sqrt{3}+1
    =4-2\sqrt{3}   (đpcm)
    Áp   dụng:
    (a-b)²=a²-2ab+b²
     

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

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