x ∧4-2x^3+3x^2-2x+1 PTĐTTNT

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x ∧4-2x^3+3x^2-2x+1 PTĐTTNT

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Maris 4 years 2020-11-01T10:56:31+00:00 1 Answers 82 views 0

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  1. Tryphena
    -1
    2020-11-01T10:57:43+00:00
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    $\begin{array}{l}x^4-2x^3+3x^2-2x+1\\ = x^4 + x^2 + 1 -2x^3 + 2x^2 – 2x\\ = (x^2)^2 + x^2 +1 – 2.x^2.x + 2.x^2.1 – 2.x.1\\ = (x^2 – x + 1)^2\end{array}$

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )