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基礎數學

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國立中興大學 2025 · 考試 · 第 7 題

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(2 points) Given three functions, F(x)=x3+x2+2x+1+x−1F(x) = x^3 + x^2 + 2x + 1 + x^{-1}, G(x)=x4log⁡x+2nx+2xnG(x) = x^4 \log x + 2^n x + 2^x n, H(x)=log⁡nx8+x3H(x) = \log_n x^8 + x^3, which of the following items has the smallest Big O?

  • (A)
    F(x)⋅H(x)+G(x)F(x) \cdot H(x) + G(x)
  • (B)
    F(x)+G(x)⋅H(x)F(x) + G(x) \cdot H(x)
  • (C)
    F(x)⋅G(x)+H(x)F(x) \cdot G(x) + H(x)
  • (D)
    F(x)⋅F(x)+G(x)⋅H(x)F(x) \cdot F(x) + G(x) \cdot H(x)
  • (E)
    F(x)⋅G(x)⋅F(x)F(x) \cdot G(x) \cdot F(x)

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