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

Toán Lớp 8: Tìm GTNN của 2x^2 – 8x + 6 / 25

Toán Lớp 8: Tìm GTNN của 2x^2 – 8x + 6 / 25

Comments ( 1 )

  1. $\\\dfrac{2x^2-8x+6}{25}\\=\dfrac{2(x^2-4x+3)}{25}\\=\dfrac{2(x^2-2.x.2+2^2-1)}{25}\\=\dfrac{2(x-2)^2 – 2}{25}$
    Do $(x-2)^2\ge 0∀x$
    $\Rightarrow \dfrac{2(x-2)^2-2}{25}\ge\dfrac{-2}{25}∀x$
    Dấu “$=$” xảy ra khi :
    $x-2=0↔x=2$
    Vậy GTNN của BT là $\dfrac{-2}{25}↔x=2$
     

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

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