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

Toán Lớp 9: Rút gọn biểu thức A = căn (x bình − 4x + 4) − 5x + 2 với x > 2

Toán Lớp 9: Rút gọn biểu thức A = căn (x bình − 4x + 4) − 5x + 2 với x > 2

Comments ( 2 )

  1. A = $\sqrt{x²-4x+4}$ – 5x + 2
    A = $\sqrt{(x-2)²}$ – 5x + 2
    A = lx – 2l – 5x + 2
    Vì x > 2 => lx – 2l = x – 2
    Do đó: A = lx – 2l – 5x + 2 
                A = x – 2 – 5x + 2
                A = -4x

  2. A=\sqrt{x^2-4x+4}-5x+2
    A=\sqrt{(x-2)^2}-5x+2
    A=|x-2|-5x+2
    A=x-2-5x+2 (x>2)
    A=-4x

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