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![](https://rs.olm.vn/images/avt/0.png?1311)
(3x - 1)^2016 + (5y - 3)^2016 < 0 (1)
có (3x - 1)^2016 > 0
(5y - 3)^2018 > 0
=> (3x-1)^2016 + (5y - 3)^2018 > 0 và (1)
=> (3x - 1)^2016 + (5y - 3)^2016 = 0
=> 3x - 1 = 0 và 5y - 3 = 0
=> x = 1/23 và y = 3/5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Vi:\hept{\begin{cases}\left(3x-1\right)^{2016}\ge0\\\left(5y-3\right)^{2018}\ge0\end{cases}}ma:\left(3x-1\right)^{2016}+\left(5y-3\right)^{2018}\le0\Rightarrow\hept{\begin{cases}5y-3=0\\3x-1=0\end{cases}}\Leftrightarrow\hept{\begin{cases}y=\frac{5}{3}\\x=\frac{1}{3}\end{cases}}.\)
\(\Rightarrow M=5^5+\frac{35}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\hept{\begin{cases}\left(2021x-1\right)^{2020}\ge0\\\left(3y+4\right)^{2022}\ge0\end{cases}}\left(\forall x,y\right)\)
\(\Rightarrow\left(2021x-1\right)^{2020}+\left(3y+4\right)^{2022}\ge0\left(\forall x,y\right)\)
Mà theo đề bài ta có: \(\left(2021x-1\right)^{2020}+\left(3y+4\right)^{2022}\le0\)
Nên từ đó suy ra: \(\hept{\begin{cases}\left(2021x-1\right)^{2020}=0\\\left(3y+4\right)^{2022}=0\end{cases}}\Leftrightarrow\hept{\begin{cases}2021x-1=0\\3y+4=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2021}\\y=-\frac{4}{3}\end{cases}}\)
Khi đó \(M=2021\cdot\frac{1}{2021}\cdot\left(-\frac{4}{3}\right)-\left(-\frac{4}{3}\right)^2\)
\(=-\frac{4}{3}-\frac{16}{9}=-\frac{28}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : \(\hept{\begin{cases}\left(x-2\right)^4\ge0\forall x\\\left(2y-1\right)^{2018}\ge0\forall y\end{cases}\Rightarrow\left(x-2\right)^4+\left(2y-1\right)^{2018}\ge0\forall x,y}\)
Dấu "=" xảy ra <=> \(\hept{\begin{cases}\left(x-2\right)^4=0\\\left(2y-1\right)^{2018}=0\end{cases}\Rightarrow\hept{\begin{cases}x-2=0\\2y-1=0\end{cases}\Rightarrow}\hept{\begin{cases}x=2\\2y=1\end{cases}}}\Rightarrow\hept{\begin{cases}x=2\\y=\frac{1}{2}\end{cases}}\)
Khi đó : \(M=11.2^2.\frac{1}{2}+4.2.\left(\frac{1}{2}\right)^2=\frac{11.4}{2}+\frac{4.2}{4}=22+2=24\)
Vậy M = 24
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\hept{\begin{cases}\left(2x-5\right)^{2018}\ge0\left(\forall x\right)\\\left(3y+4\right)^{2020}\ge0\left(\forall y\right)\end{cases}}\Rightarrow\left(2x-5\right)^{2018}+\left(3y+4\right)^{2020}\ge0\left(\forall x,y\right)\)
Mà \(\left(2x-5\right)^{2018}+\left(3y+4\right)^{2020}\le0\left(\forall x,y\right)\)
\(\Rightarrow\hept{\begin{cases}\left(2x-5\right)^{2018}=0\\\left(3y+4\right)^{2020}=0\end{cases}}\Leftrightarrow\hept{\begin{cases}2x-5=0\\3y+4=0\end{cases}}\Rightarrow\hept{\begin{cases}x=\frac{5}{2}\\y=-\frac{4}{3}\end{cases}}\)
Khi đó thay vào ta được:
\(M+5\cdot\left(\frac{5}{2}\right)^2-2\cdot\frac{5}{2}\cdot\left(-\frac{4}{3}\right)=6\cdot\left(\frac{5}{2}\right)^2+9\cdot\frac{5}{2}\cdot\left(-\frac{4}{3}\right)-\left(-\frac{4}{3}\right)^2\)
\(\Leftrightarrow M+\frac{455}{12}=\frac{103}{18}\)
\(\Rightarrow M=-\frac{1159}{36}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Xét \(x+y+z=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}y+z=-x\\z+x=-y\\x+y=-z\end{matrix}\right.\)
\(\Rightarrow A=\left(2-1\right)\left(2-1\right)\left(2-1\right)=1\)
Xét \(x+y+z\ne0\) thì ta có:
\(\dfrac{x}{y+z+3x}=\dfrac{y}{z+x+3y}=\dfrac{z}{x+y+3z}=\dfrac{x+y+z}{5x+5y+5z}=\dfrac{x+y+z}{5\left(x+y+z\right)}=\dfrac{1}{5}\)
\(\Rightarrow\left\{{}\begin{matrix}5x=y+z+3x\\5y=z+x+3y\\5z=x+y+3z\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x=y+z\\2y=z+x\\2z=x+y\end{matrix}\right.\)
\(\Rightarrow A=\left(2+2\right)\left(2+2\right)\left(2+2\right)=64\)
Vậy \(\left[{}\begin{matrix}A=1\\A=64\end{matrix}\right.\)
Nếu bị lỗi thì bạn có thể xem đây nhé:
\(\forall\) là dấu j
∀ là mọi, ∀ x là mọi x