Ta có: x=71
nên x-1=70
Ta có: \(A=x^5-70x^4-70x^3-70x^2-70x^2-70x+29\)
\(=x^5-x^4\left(x-1\right)-x^3\left(x-1\right)-x^2\left(x-1\right)-x\left(x-1\right)+29\)
\(=x^5-x^5+x^4-x^4+x^3-x^3+x^2-x^2+x+29\)
=x+29
=71+29
=100
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