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Tìm giá trị nhỏ nhất A= x^2—2x+2017

a) Tìm giá trị nhỏ nhất: A= 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  bởi Nguyễn Lê Tín 29/12/2019
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Câu trả lời (1)

  • Giải : Ta có: A=\(\dfrac{x^2-2x+2017}{x^2}\)

    =\(\dfrac{\left(x-1\right)^2}{x^2}+\dfrac{2016}{x^2}\)\(\ge\) \(\dfrac{2016}{x^2}\)

    Dấu đẳng thức xảy ra \(\Leftrightarrow\) \(\left(x-1\right)^2=0\Leftrightarrow x=1\)

    Vậy Min A = 2016 \(\Leftrightarrow\) x=1

      bởi Chịp Thúy 29/12/2019
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