b) (x - 7)^2020 = (x - 7)^2022
giúp mình với
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\left(x-5\right)^{2020}+\left(y-x+1\right)^{2022}=0\left(1\right)\)
Ta có \(\left\{{}\begin{matrix}\left(x-5\right)^{2020}\ge0,\forall x\\\left(y-x+1\right)^{2022}\ge0,\forall x;y\end{matrix}\right.\)
\(\left(1\right)\Rightarrow\left\{{}\begin{matrix}\left(x-5\right)^{2020}=0\\\left(y-x+1\right)^{2022}=0\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x-5=0\\y-x+1=0\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=5\\y-5+1=0\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=5\\y=4\end{matrix}\right.\)
c, \(x\)(\(x\) - 2022) + 4.(2022 - \(x\)) = 0
(\(x\) - 2022).(\(x\) - 4) = 0
\(\left[{}\begin{matrix}x-2022=0\\x+4=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=2022\\x=4\end{matrix}\right.\)
\(\Leftrightarrow\left(\dfrac{x+1}{2022}+1\right)+\left(\dfrac{x+3}{2020}+1\right)+\left(\dfrac{x+5}{2018}+1\right)+\left(\dfrac{x+7}{2016}+1\right)=0\)
=>x+2023=0
=>x=-2023
Lời giải:
\(\frac{2022\times 2023-3}{2023\times 2021+2020}=\frac{2023\times (2021+1)-3}{2023\times 2021+2020}
\\
=\frac{2023\times 2021+2023-3}{2023\times 2021+2020}=\frac{2023\times 2021+2020}{2023\times 2021+2020}=1\)
1: \(A=6^{2020}\left(1+6\right)+6^{2022}\left(1+6\right)\)
\(=7\left(6^{2020}+6^{2022}\right)⋮7\)
Bài 1:
$A=6^{2020}(1+6+6^2+6^3)=6^{2020}.259=6^{2020}.7.37\vdots 7$
Ta có đpcm.
( x - 1 )2018 + (y - 2 )2020+(z-3)2022=0
\(\Leftrightarrow\left\{{}\begin{matrix}x-1=0\\y-2=0\\z-3=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=2\\z=3\end{matrix}\right.\)
\(A=\dfrac{1}{9}\left(-x\right)^{2021}y^2z^3=\dfrac{1}{3}\left(-1\right)^{2021}.2^2.3^3=\dfrac{1}{3}.\left(-1\right).4.27=-36\)
\(\left(x-7\right)^{2020}-\left(x-7\right)^{2022}=0\\=> \left(x-7\right)^{2020}\left[1-\left(x-7\right)^2\right]=0\\ =>\left[{}\begin{matrix}\left(x-7\right)^{2020}=0\\1-\left(x-7\right)^2=0\end{matrix}\right.=>\left[{}\begin{matrix}x-7=0\\x-7=1\\x-7=-1\end{matrix}\right.=>\left[{}\begin{matrix}x=7\\x=8\\x=6\end{matrix}\right.\)