Giải phương trình:
(x-1)2020+(x-2)2020=1
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TG
1
TG
17 tháng 1 2021
\(\dfrac{1}{\left(x+1\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+3\right)}+....+\dfrac{1}{\left(x+2020\right)\left(x+2021\right)=1}\)
\(\Leftrightarrow\dfrac{1}{x+1}-\dfrac{1}{x+2}+\dfrac{1}{x+2}-\dfrac{1}{x+3}+...+\dfrac{1}{x+2020}-\dfrac{1}{x+2021}=1\)
\(\Leftrightarrow\dfrac{1}{x+1}-\dfrac{1}{x+2021}=1\)
\(\Leftrightarrow\dfrac{\left(x+2021\right)-\left(x+1\right)}{\left(x+1\right)\left(x+2021\right)}=1\)
\(\Leftrightarrow\dfrac{x+2021-x-1}{\left(x+1\right)\left(x+2021\right)}=1\)
\(\Leftrightarrow\dfrac{2020}{\left(x+1\right)\left(x+2021\right)}=1\)
\(\Leftrightarrow\left(x+1\right)\left(x+2021\right)=2020\)
\(\Leftrightarrow x^2+2021x+x+2021=2020\)
\(\Leftrightarrow x^2+2022x=-1\)
\(\Leftrightarrow x\left(x+2022\right)=-1\)
Đến đây bạn chia trường hợp để giaỉ ra nghiệm nguyên nhé
DD
0
20 tháng 3 2023
=>\(\left(\dfrac{x+1}{2021}+1\right)+\left(\dfrac{x+2}{2020}+1\right)+\left(\dfrac{x+3}{2019}+1\right)+\left(\dfrac{x+2028}{2}-3\right)=0\)
=>x+2022=0
=>x=-2022
9 tháng 5 2021
ĐKXĐ : \(\left\{{}\begin{matrix}x>2019\\y>2020\\z>2021\end{matrix}\right.\)
Đặt \(\sqrt{x-2019}=a,......\)
Ta được PT : \(\dfrac{1-a}{a^2}+\dfrac{1-b}{b^2}+\dfrac{1-c}{c^2}+\dfrac{3}{4}=0\)
\(\Leftrightarrow\dfrac{1}{a^2}-\dfrac{1}{a}+\dfrac{1}{4}+\dfrac{1}{b^2}-\dfrac{1}{b}+\dfrac{1}{4}+\dfrac{1}{c^2}-\dfrac{1}{c}+\dfrac{1}{4}=0\)
\(\Leftrightarrow\left(\dfrac{1}{a}-\dfrac{1}{2}\right)^2+\left(\dfrac{1}{b}-\dfrac{1}{2}\right)^2+\left(\dfrac{1}{c}-\dfrac{1}{2}\right)^2=0\)
- Thấy : \(\left(\dfrac{1}{a}-\dfrac{1}{2}\right)^2\ge0,......\)
\(\Rightarrow\left(\dfrac{1}{a}-\dfrac{1}{2}\right)^2+\left(\dfrac{1}{b}-\dfrac{1}{2}\right)^2+\left(\dfrac{1}{c}-\dfrac{1}{2}\right)^2\ge0\)
- Dấu " = " xảy ra <=> \(\left\{{}\begin{matrix}\dfrac{1}{a}=\dfrac{1}{2}\\\dfrac{1}{b}=\dfrac{1}{2}\\\dfrac{1}{c}=\dfrac{1}{2}\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=2\\b=2\\c=2\end{matrix}\right.\)
- Thay lại a. b. c ta được : \(\left\{{}\begin{matrix}\sqrt{x-2019}=2\\\sqrt{y-2020}=2\\\sqrt{z-2021}=2\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-2019=4\\y-2020=4\\z-2021=4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=2023\\y=2024\\z=2025\end{matrix}\right.\) ( TM )
Vậy ...
BP
3
NH
3 tháng 4 2023
\(\dfrac{x-1}{2023}+\dfrac{x-2}{2022}=\dfrac{x-3}{2021}+\dfrac{x-4}{2020}\)
`<=>(x-1)/2023-1+(x-2)/2022-1=(x-3)/2021-1+(x-4)/2020-1`
`<=>(x-2024)/2023+(x-2024)/2022=(x-2024)/2021+(x-2024)/2020`
`<=>(x-2024)(1/2023+1/2022-1/2021-1/2020)=0`
`<=>x-2024=0(1/2023+1/2022-1/2021-1/2020>0)`
`<=>x=2024`
3 tháng 4 2023
=>\(\left(\dfrac{x-1}{2023}-1\right)+\left(\dfrac{x-2}{2022}-1\right)=\left(\dfrac{x-3}{2021}-1\right)+\left(\dfrac{x-4}{2020}-1\right)\)
=>x-2024=0
=>x=2024
PN
0
HH
1
6 tháng 1 2022
\(\dfrac{x+1}{2020}+\dfrac{x-1}{2018}=\dfrac{x+5}{2024}+\dfrac{x-5}{2014}\)
\(\Leftrightarrow\left(\dfrac{x+1}{2020}-1\right)+\left(\dfrac{x-1}{2018}-1\right)-\left(\dfrac{x+5}{2024}-1\right)-\left(\dfrac{x-5}{2014}-1\right)=0\)
\(\Leftrightarrow\dfrac{x-2019}{2020}+\dfrac{x-2019}{2018}-\dfrac{x-2019}{2024}-\dfrac{x-2019}{2014}=0\)
\(\Leftrightarrow\left(x-2019\right)\left(\dfrac{1}{2020}+\dfrac{1}{2018}-\dfrac{1}{2024}-\dfrac{1}{2014}\right)=0\)
\(\Leftrightarrow x-2019=0\\ \Leftrightarrow x=2019\)
(x-1)2020+(x-2)2020=1
x2020-12020+x2020-22020=1
(x-1+x-2)2020=1
(2x-3)2020=1=>2x=4 vậy x =1
\(\left(x-1\right)^{2020}+\left(x-2\right)^{2020}=1\)
\(\Leftrightarrow\left(x-1+x-2\right)^{2020}=1\)
\(\Leftrightarrow\left(2x-3\right)^{2020}=1\)
\(\Leftrightarrow2x-3=1\)
\(\Leftrightarrow2x=4\)
\(\Leftrightarrow x=2\)
Vậy tập nghiệm \(S=\left\{2\right\}\)