1.Tìm: Min B = x^2 + 5x – 4 Min C = 2x^2 – 6x – 10 Min D = 4x^2 – 8x – 17 Min E = x^2 +x Max F = -x^2 + 4x – 3 Max G = -4x^2 + 6x – 9 Max H = -x^2 +x

Bởi

1.Tìm:
Min B = x^2 + 5x – 4
Min C = 2x^2 – 6x – 10
Min D = 4x^2 – 8x – 17
Min E = x^2 +x
Max F = -x^2 + 4x – 3
Max G = -4x^2 + 6x – 9
Max H = -x^2 +x
Max M = x^2 – 6x +9
Max N = x^2 – 4x -5
Max P = x^2 – 6x – y^2 – 2y +12
2.Cho x^2 = y^2 + 4x^2.CMR:
(5x-3y+8z)(5x-3y-8z)=(3x-5y)^2

0 bình luận về “1.Tìm: Min B = x^2 + 5x – 4 Min C = 2x^2 – 6x – 10 Min D = 4x^2 – 8x – 17 Min E = x^2 +x Max F = -x^2 + 4x – 3 Max G = -4x^2 + 6x – 9 Max H = -x^2 +x”

  1. Bài 1:

    +)Ta có: B=x²+2.5/2.x+(5/2)²-41/4

                 =(x+5/2)²-41/4

    Vậy Bmin=41/4 khi x=-5/2

    +)Ta có:C = 2x² – 2.√2.(3√2/2).x+9/2-29/2

                    =(√2x-3√2/2)²-29/2

    Vậy Cmin=29/2 khi x=3/2

    (các câu sau tương tự)

     

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