\(x^6-x^5+x^4-x^3+x^2-x+\dfrac{3}{4}=0\)
\(\Rightarrow\left(x^6-x^5\right)+\left(x^4-x^3\right)+\left(x^2-x\right)+\dfrac{3}{4}=0\)
\(\Rightarrow x^5\left(x-1\right)+x^3\left(x-1\right)+x\left(x-1\right)+\dfrac{3}{4}=0\)
\(\Rightarrow\left(x-1\right)\left(x^5+x^3+x\right)+\dfrac{3}{4}=0\)
.... bí cmnr :))