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![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm:
Vì x=2011 => x+1=2012(*)
Thay (*) vào f(x) ta được:
f(2011) = x6 - (x+1)x5 + (x+1)x4 - (x+1)x3 + (x+1)x2 - (x+1)x + 2017
f(2011) = x6 - x5 - x4 + x3 + x2 - x2 - x +2017
f(2011) = -x +2017
f(2011) = -2011 + 2017
f(2011) = 6
Học tốt!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải:
Thay \(2012=x+1\) vào biểu thức ta có:
\(\Rightarrow B=x^{2011}-\left(x+1\right).x^{2010}+\left(x+1\right).x^{2009}-...-\left(x+1\right).x^2+\left(x+1\right).x-1\)
\(=x^{2011}-x^{2011}-x^{2010}+x^{2010}+x^{2009}-...-x^2+x^2+x-1\)
\(=x-1\)
\(\Rightarrow B=2011-1=2010\)
Vậy \(B=2010\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x=2011\Rightarrow2012=x+1\)
\(\Rightarrow M\left(2011\right)=x^4-\left(x+1\right)x^3+\left(x+1\right)x^2-\left(x+1\right)x+1\)
\(=x^4-x^4-x^3+x^3+x^2-x^2-x+1\)
\(=-x+1=-2011+1=-2010\)
![](https://rs.olm.vn/images/avt/0.png?1311)
cho 2012=x+1
B=x2012 - (x+1)x^2010+(x+1)x^2009-...+(x+1)x+1
B=x^2012-x^2012-x^2011+x^2011+x^2010-...+x^2+x+1
B=x+1=2012
![](https://rs.olm.vn/images/avt/0.png?1311)
x=2011 nên x+1=2012
\(P\left(x\right)=x^4-x^3\left(x+1\right)+x^2\left(x+1\right)-x\left(x+1\right)+x+1\)
\(=x^4-x^4-x^3+x^3+x^2-x^2-x+x+1=1\)