\(ta\)\(có\)\(a^5+1=a^5+a^4-a^4-a^3+a^3+a^2-a^2+1\)
\(=a^4\left(a+1\right)-a^3\left(a+1\right)+a^2\left(a+1\right)+\left(-a+1\right)\left(a+1\right)\)
\(=\left(a+1\right)\left(a^4-a^3+a^2-a+1\right)\)
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