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\(\left(2x+5\right)^{2016}\ge0;\left(5y-4\right)^{2016}\ge0\)
=>\(\left(2x+5\right)^{2016}+\left(5y-4\right)^{2016}\ge0\)
theo đề:\(\left(2x+5\right)^{2016}+\left(5y-4\right)^{2016}\le0\)
=>(2x+5)2016=(5y-4)2016=0
ta có:(2x+5)2016=0=>2x=-5=>x=-5/2=-2,5
(5y-4)2016=0=>5y=4=>y=4/5=0,8
vậy y=0,8
(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
Ta có: \(\hept{\begin{cases}\left(5x-y\right)^{2016}\ge0\\\left|x^2-4\right|^{2017}\ge0\end{cases}\Rightarrow\left(5x-y\right)^{2016}+\left|x^2-4\right|\ge}0\)
Mà \(\left(5x-y\right)^{2016}+\left|x^2-4\right|^{2017}\le0\)
\(\Rightarrow\hept{\begin{cases}\left(5x-y\right)^{2016}=0\\\left|x^2-4\right|^{2017}=0\end{cases}\Rightarrow\hept{\begin{cases}5x-y=0\\x^2-4=0\end{cases}}\Rightarrow\hept{\begin{cases}y=\pm10\\x=\pm2\end{cases}}}\)
Vậy các cặp (x;y) là (2;10);(-2;-10)
Vì \(\left(2x-5\right)^{2016}\ge0\forall x;\left(3y+4\right)^{2020}\ge0\forall y\)
\(\Rightarrow\left(2x-5\right)^{2016}+\left(3y+4\right)^{2020}\ge0\)
Mà đề lại cho \(\left(2x-5\right)^{2016}+\left(3y+4\right)^{2020}\le0\)
Nên \(\hept{\begin{cases}\left(2x-5\right)^{2016}=0\\\left(3y+4\right)^{2020}=0\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{5}{2}\\y=-\frac{4}{3}\end{cases}}}\)
Vậy ..........
\(\left(2x-5\right)^{2016}+\left(3y+4\right)^{2018}\le0\)
Ta có:
\(\left\{{}\begin{matrix}\left(2x-5\right)^{2016}\ge0\\\left(3y+4\right)^{2018}\ge0\end{matrix}\right.\forall x.\)
\(\Rightarrow\left(2x-5\right)^{2016}+\left(3y+4\right)^{2018}=0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left(2x-5\right)^{2016}=0\\\left(3y+4\right)^{2016}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x-5=0\\3y+4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=0+5=5\\3y=0-4=-4\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=5:2\\y=\left(-4\right):3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\frac{5}{2}\\y=-\frac{4}{3}\end{matrix}\right.\)
Vậy \(\left(x;y\right)\in\left\{\frac{5}{2};-\frac{4}{3}\right\}.\)
Chúc bạn học tốt!
Vì: \(\left(2x-5\right)^{2016}\ge0;\left(3y+4\right)^{2020}\ge0\)
Nên: \(\left(2x-5\right)^{2016}+\left(3y+4\right)^{2020}\le0\)
\(\Leftrightarrow\left(2x-5\right)^{2016}+\left(3y+4\right)^{2020}=0\)
\(\Leftrightarrow\begin{cases}2x-5=0\\3y+4=0\end{cases}\)\(\Leftrightarrow\begin{cases}x=\frac{5}{2}\\y=-\frac{4}{3}\end{cases}\)
\(\left(\frac{2x-3}{4}\right)^{2014}+\left(\frac{3y+4}{5}\right)^{2016}=0\)
Có: \(\left(\frac{2x-3}{4}\right)^{2014}\ge0;\left(\frac{3y+4}{5}\right)^{2016}\ge0\)
Mà theo bài ra: \(\left(\frac{2x-3}{4}\right)^{2014}+\left(\frac{3y+4}{5}\right)^{2016}=0\)
\(\Rightarrow\hept{\begin{cases}\frac{2x-3}{4}=0\\\frac{3y+4}{5}=0\end{cases}}\Rightarrow\hept{\begin{cases}2x-3=0\\3y+4=0\end{cases}}\Rightarrow\hept{\begin{cases}2x=3\\3y=-4\end{cases}}\Rightarrow\hept{\begin{cases}x=\frac{3}{2}\\y=-\frac{4}{3}\end{cases}}\)
Vậy: \(\hept{\begin{cases}x=\frac{3}{2}\\y=-\frac{4}{3}\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}\frac{2x-3}{4}=0\\\frac{3y+4}{5}=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\frac{3}{2}\\y=-\frac{4}{3}\end{cases}}}\)
thay x=-2,5 vào ta dc
(2.(-2.5))2106+(5y-4)2016
=0+(5y-4)2016
=>(5y-4)2016=0
rồi bạn tìm y
(2x + 5)2016 + (5y - 4)2016 luôn \(\ge0\)
Mà theo đề: \(\left(2x+5\right)^{2016}+\left(5y-4\right)^{2016}\le0\)
=> (2x + 5)2016 = (5y + 4)2016 = 0
Đề đã cho x = -2,5
=> 5y + 4 = 0
=> 5y = -4
=> y = -4/5