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

Toán Lớp 9: Giúp mik câu này vs ạ Tìm ĐKXĐ $\sqrt { x^{2} -x + 1 }$ = 2x – 1

Toán Lớp 9: Giúp mik câu này vs ạ
Tìm ĐKXĐ
$\sqrt { x^{2} -x + 1 }$ = 2x – 1

Comments ( 1 )

  1. #LC
    \sqrt(x^2-x+1) = 2x-1 ĐK: 2x-1≥0 ⇔ x≥1/2
    ⇔ x^2 – x+1=4x^2-4x+1
    ⇔ 3x^2 -3x=0
    ⇔ x(3x-3)=0
    ⇔\(\left[ \begin{array}{l}x=0(loại)\\x=1(t/m)\end{array} \right.\) 
    Vậy, x=1

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

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