Tìm x x^2-x+1/4=0 x^3-0.25x=0 x^2-10x=-25 4x^2-4x=-1 8x^3+12x^2+6x+1=0

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1. Tìm x

   x^2 – x + 1/4 = 0

   x(x -1/2) = 0

   x = 0

   x – 1/2 = 0

   x = 1/2

   x^3 – 0.25x = 0

   x(x^2 – 0.25) = 0

   x = 0

   x^2 – 0,25 = 0

   x = 0,5

   x^2 – 10x =-25

   x(x – 10) = -25

   x = -25

   x – 10 = -25

   x = -15

   4x^2 – 4x = -1

   4x(x – 1) = -1

   4x = -1 → x = -1/4

   x – 1 = -1 → x = 0

   8x^3 + 12x^2 + 6x + 1 = 0

   2x(4x^2 + 6x + 3x + 1) = 0

   2x(4x^2 + 9x + 1) = 0

   2x = 0 → x = 0

   4x^2 + 9x + 1 = 0

   -2 khác 0

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