\(M=\left(x^5-2021x^4\right)-\left(x^4-2021x^3\right)+\left(x^3-2021X^2\right)-\left(x^2-2021x\right)+\left(x-2021\right)-900=-900\)

Ta có: x=2021

nên x+1=2022

Ta có: \(M=x^5-2022x^4+2022x^3-2022x^2+2022x-2921\)

\(=x^5-x^4\left(x+1\right)+x^3\left(x+1\right)-x^2\left(x+1\right)+x\left(x+1\right)-2921\)

\(=x^5-x^5-x^4+x^4+x^3-x^3-x^2+x^2+x-2921\)

\(=x-2921=-900\)

\(x=2021\Leftrightarrow x+1=2022\\ \Leftrightarrow P=x^5-\left(x+1\right)x^4+\left(x+1\right)x^3-\left(x+1\right)x^2+\left(x+1\right)x-x\\ P=x^5-x^5-x^4+x^4+x^3-x^3-x^2+x^2+x-x\\ P=0\)

\(P=x^5-2022x^4+2022x^3-2022x^2+2022x-2021=x^4\left(x-2021\right)-x^3\left(x-2021\right)+x^2\left(x-2021\right)-x\left(x-2021\right)+\left(x-2021\right)\)

\(=\left(x-2021\right)\left(x^4-x^3+x^2-x+1\right)\)

\(=\left(2021-2021\right)\left(x^4-x^3+x^2-x+1\right)=0\)

\(PT\Leftrightarrow2022x^2+2022x-2021x-2021=0\)

\(\Leftrightarrow2022x\left(x+1\right)-2021\left(x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(2022x-2021\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x+1=0\\2022x-2021=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-1\\x=\dfrac{2021}{2022}\end{matrix}\right.\)

Vậy: \(S=\left\{-1;\dfrac{2021}{2022}\right\}\)

giúp với ạ

\(2022x^2+x-2021=0\)

\(\Leftrightarrow2022x^2+2022x-2021x-2021=0\)

\(\Leftrightarrow2022x\left(x+1\right)-2021\left(x+1\right)=0\)

\(\Leftrightarrow\left(2022x-2021\right)\left(x+1\right)=0\Leftrightarrow x=\dfrac{2021}{2022};x=-1\)

\(Q\left(x\right)=x^{101}-2020x^{100}-2022x^{99}+2022x^{98}+x-2021\)

\(=x^{100}\left(x-2021\right)+x^{99}\left(x-2021\right)-x^{98}\left(x-2021\right)+x^{98}+x-2021\)

\(Q\left(2021\right)=0+0-0+2021^{98}+0=2021^{98}\)

Yêu cần bài là j bn

Đăng yêu cầu mik làm cho 

Học tốt

a: \(2022^{x-2021}+3=\left(7-5\right)^2\)

=>\(2022^{x-2021}+3=4\)

=>\(2022^{x-2021}=1\)

=>x-2021=0

=>x=2021

b: \(\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=795\)

=>\(30x+\left(1+2+3+...+30\right)=795\)

=>\(30x+\dfrac{30\cdot31}{2}=795\)

=>\(30x=795-31\cdot15=330\)

=>x=11