x³-2x²+2x-1=0 tìm x ạ!!

1 bình luận về “x³-2x²+2x-1=0 tìm x ạ!!”

1. #wdr

   x^3-2x^2+2x-1=0

   (x^3-1)-(2x^2-2x)=0

   (x-1)(x^2+x+1) – 2x(x-1)=0

   (x-1)(x^2+x+1-2x)=0

   => x-1=0

   x=1

   => x^2+x+1-2x=0

   (x+1)^2 +x=0

   (x+1)^2 =-x

   => x={∅}

   Vậy x={1}

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