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\(^{P\left(x\right)=x^{2018}-100x^{2017}+100x^{2016}-...+100x+2016}\) \(^{P\left(99\right)=x^{2018}-\left(99+1\right)x^{2017}+\left(99+1\right)x^{2016}-...+\left(99+1\right)x+2016}\) \(^{P\left(99\right)=x^{2018}-x^{2018}-x^{2017}+x^{2017}+x^{2016}-...+x^2+x+2016}\) \(^{P\left(99\right)=x+2016=99+2016=2115}\)
\(f\left(x\right)=x^{99}-100x^{98}+100x^{97}-...+100x-1\)
\(f\left(99\right)=99^{99}-100\cdot99^{98}+100\cdot99^{97}-...+100\cdot99-1\)
\(f\left(99\right)=99^{99}-\left(99+1\right)\cdot99^{98}+\left(99+1\right)\cdot99^{97}-...+\left(99+1\right)\cdot99-1\)
\(f(99)= 99^{99}-99^{99}-99^{98}+99^{98}+99^{97}-99^{97}-99^{96}+...+99^2+99-1\)
\(f\left(99\right)=99-1=98\)
Ta có \(A\left(\frac{1}{2}\right)=\frac{1}{2}+\left(\frac{1}{2}\right)^2+\left(\frac{1}{2}\right)^3+...+\left(\frac{1}{2}\right)^{100}=\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{100}}\)
=> \(2.A\left(\frac{1}{2}\right)=1+\frac{1}{2}+\frac{1}{2^2}+...+\frac{1}{2^{99}}\)
=> \(2A\left(\frac{1}{2}\right)-A\left(\frac{1}{2}\right)=\left(1+\frac{1}{2}+\frac{1}{2^2}+...+\frac{1}{2^{99}}\right)-\left(\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{100}}\right)\)
=> \(A\left(\frac{1}{2}\right)=1-\frac{1}{2^{100}}\)
x=99
=>x+1=100
thay x+1=100 và 99=x vào B ta được:
x99-(x+1).x98+(x+1).x97-(x+1).x96+...+(x+1).x-1
=x99-x99-x98+x98+x97-x97-x96+...+x2+x-1
=x-1
=99-1
=98
Vậy B=98
\(Q\left(x\right)=x^{101}-2020x^{100}-2022x^{99}+2022x^{98}+x-2021\)
\(=x^{100}\left(x-2021\right)+x^{99}\left(x-2021\right)-x^{98}\left(x-2021\right)+x^{98}+x-2021\)
\(Q\left(2021\right)=0+0-0+2021^{98}+0=2021^{98}\)
đề bài ra sai rùi hay sao ý bn: tại x +1/2 tính kiểu j???