mọi người ơi giúp em vs ạ , e đang rất cần 

\(1+2+...+n=\dfrac{\left(\dfrac{n-1}{1}+1\right).\left(n+1\right)}{2}=\dfrac{n\left(n+1\right)}{2}\)

\(M=\dfrac{3}{1+2}+\dfrac{3}{1+2+3}+...+\dfrac{3}{1+2+...+2022}\)

\(=3\left(\dfrac{1}{1+2}+\dfrac{1}{1+2+3}+...+\dfrac{1}{1+2+...+2022}\right)\)

\(=3\left(\dfrac{1}{\dfrac{2.\left(2+1\right)}{2}}+\dfrac{1}{\dfrac{3.\left(3+1\right)}{2}}+...+\dfrac{1}{\dfrac{2022.\left(2022+1\right)}{2}}\right)\)

\(=3\left(\dfrac{2}{2.3}+\dfrac{2}{3.4}+...+\dfrac{2}{2022.2023}\right)\)

\(=3.2.\left(\dfrac{1}{2.3}+\dfrac{1}{3.4}+...+\dfrac{1}{2022.2023}\right)\)

\(=6.\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{2022}-\dfrac{1}{2023}\right)\)

\(=6.\left(\dfrac{1}{2}-\dfrac{1}{2023}\right)\)

\(=6.\dfrac{2021}{4046}=3.\dfrac{2021}{2023}=\dfrac{6063}{2023}=\dfrac{18189}{6069}\)

\(\dfrac{10}{3}=\dfrac{20230}{6069}>\dfrac{18189}{6069}=M\)

i giúp em vớiiiiii

\(M=\dfrac{3}{1+2}+\dfrac{3}{1+2+3}+...+\dfrac{3}{1+2+...+2022}\)

\(=\dfrac{3}{\dfrac{2\left(2+1\right)}{2}}+\dfrac{3}{\dfrac{3\left(3+1\right)}{2}}+...+\dfrac{3}{\dfrac{2022\left(2022+1\right)}{2}}\)

\(=\dfrac{6}{2\left(2+1\right)}+\dfrac{6}{3\left(3+1\right)}+...+\dfrac{6}{2022\cdot2023}\)

\(=\dfrac{6}{2\cdot3}+\dfrac{6}{3\cdot4}+...+\dfrac{6}{2022\cdot2023}\)

\(=6\left(\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+...+\dfrac{1}{2022\cdot2023}\right)\)

\(=6\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{2022}-\dfrac{1}{2023}\right)\)

\(=6\cdot\left(\dfrac{1}{2}-\dfrac{1}{2023}\right)=6\cdot\dfrac{2021}{4046}=\dfrac{12126}{4046}< 3\)

mà \(3< \dfrac{10}{3}\)

nên \(M< \dfrac{10}{3}\)

1-2+3-4+...+2021-2022+2023

=(1-2)+(3-4)+...+(2021-2022)+2023

=(-1)+(-1)+(-1)+...+(-1)+2023

=(-1011)+2023

=1012

\(1-2+3-4+...+2021-2022+2023\)

\(=\left(-1\right)+\left(-1\right)+...+\left(-1\right)+2023\)

\(=-1011+2023=1012\)

câu a chưa đủ đề em hấy

c, \(x\)(\(x\) - 2022) + 4.(2022 - \(x\)) = 0

       (\(x\) - 2022).(\(x\) - 4) = 0

         \(\left[{}\begin{matrix}x-2022=0\\x+4=0\end{matrix}\right.\)

          \(\left[{}\begin{matrix}x=2022\\x=4\end{matrix}\right.\)

b, (\(x\) - 1)(\(x^2\) + \(x\) + 1) - \(x\)(\(x\) - 2)(\(x\) + 2)  = 7

     \(x^3\) - 1 - \(x\).(\(x^2\) - 4) = 7

      \(x^3\) - 1 - \(x^3\) + 4\(x\)  = 7

        (\(x^3\) - \(x^3\)) - 1 + 4\(x\) = 7

                       - 1 + 4\(x\) = 7

                               4\(x\) = 7 + 1

                               4\(x\) = 8

                                  \(x\) = 8:4

                                   \(x\) = 2

\(m+\left(2022+n\right)=725+\left(2022+n\right)\)

\(\Rightarrow m+2022+n=725+2022+n\)

\(\Rightarrow m+n-n=725+2022-2022\)

\(\Rightarrow m=725\)

725

m + (2022 + n) = 725 + (2022 + n)

Ta có: m + (2022 + n) = 725 + (2022 + n)

                    2022 + n = 2022 + n

Vậy m = 725

Cho `M(x)=0`

`=>x^2+2x+2022=0`

`=>x^2+2x+1+2021=0`

`=>(x+1)^2=-2021` (Vô lí vì `(x+1)^2 >= 0` mà `-2021 < 0`)

Vậy đa thức `M(x)` không có nghiệm

Ta có M(x) = x² + 2x + 2022

= x² + x + x + 1 + 2021

= x(x + 1) + (x + 1) + 2021

= (x+1) . (x+1) + 2021

= (x+1)² + 2021

Ta có ( x + 1)² \(\ge\)0

2021 > 0

=>  (x+1)² + 2021 > 0

=>  x² + 2x + 2022> 0

Vậy đa thức trên không có nghiệm

M(x)= x² +2x + 2022

\(M\left(x\right)=x^2+x+x+1+2021\)

\(M\left(x\right)=x\left(x+1\right)+\left(x+1\right)+2021\)

\(M\left(x\right)=\left(x+1\right)\left(x+1\right)+2021=\left(x+1\right)^2+2021\)

ta có \(\left(x+1\right)^2\ge0\forall x\)

mà 2021 > 0

\(=>\left(x+1\right)^2+2021>0\)

hay M(x)= x² +2x + 2022 ko có nghiệm

Phân số bé nhất là: \(\dfrac{2021}{2022}\)

2020/2021

\(\dfrac{3}{4}\) em nhé