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

Toán Lớp 10: rút gọn x-2- căn 4-4x+x^2 vs x<0

Toán Lớp 10: rút gọn x-2- căn 4-4x+x^2 vs x<0

Comments ( 2 )

  1. #tnvt
    x-2-\sqrt{4-4x+x^2}(x<0)
    =x-2-\sqrt{2^2-2.x.2+x^2}
    =x-2-\sqrt{(2-x)^2}
    =x-2-|2-x|
    =x-2-(2-x)
    =x-2-2+x
    =2x-4

  2. $\textit{Giải đáp + Lời giải và giải thích chi tiết:}$
    $\text{$x^{}$ – 2 – $\sqrt{4 – 4x + x^2}$ ($x^{}$ > 0)}$
    $\text{= $x^{}$ – 2 – $\sqrt{(2 – x)^2}$}$
    $\text{= $x^{}$ – 2 – (2 – $x^{}$)}$
    $\text{= $x^{}$ – 2 – 2 + $x^{}$}$
    $\text{= $2x^{}$ – 4}$
     

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

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