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\(\left|x-3y\right|^{2014}+\left|y+4\right|^{2012}=0\)
\(Do\)\(\left|x-3y\right|^{2014}\ge0\)\(;\left|y+4\right|^{2012}\ge0\)
\(\Rightarrow\orbr{\begin{cases}\left|x-3y\right|^{2014}=0\\\left|x+4\right|^{2012}=0\end{cases}\Rightarrow\orbr{\begin{cases}x=12\\y=-4\end{cases}}}\)
\(KL\)
=> x - 3 = 0 va 3y - 12 = 0
x = 3 ; y = 4
x;y = (3;4)
Ta có:
\(\left(x-3\right)^{2012}\)>=0
\(^{\left(3y-12\right)^{2014}}\)>=0
Mà \(\left(x-3\right)^{2012}\)+\(^{\left(3y-12\right)^{2014}}\)<=0
=>\(\left(x-3\right)^{2012}\)=0 =>X-3=0 =>x=3
=>\(^{\left(3y-12\right)^{2014}}\)=0 =>3y-12=0 =>3y=12 =>y=4
Vậy x=3;y=4
\(\left(2x-5\right)^{2020}+\left(3y+4\right)^{2018}\le0\)
Ta có:
\(\left\{{}\begin{matrix}\left(2x-5\right)^{2020}\ge0\\\left(3y+4\right)^{2018}\ge0\end{matrix}\right.\forall xy.\)
\(\Rightarrow\left(2x-5\right)^{2020}+\left(3y+4\right)^{2018}\ge0\) \(\forall xy.\)
Mà \(\left(2x-5\right)^{2020}+\left(3y+4\right)^{2018}\le0.\)
\(\Rightarrow\left(2x-5\right)^{2020}+\left(3y+4\right)^{2018}=0\)
\(\Rightarrow\left(2x-5\right)+\left(3y+4\right)=0\)
\(\Rightarrow\left\{{}\begin{matrix}2x-5=0\\3y+4=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}2x=5\\3y=-4\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=5:2\\y=\left(-4\right):3\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=\frac{5}{2}\\y=-\frac{4}{3}\end{matrix}\right.\)
Vậy \(\left(x;y\right)\in\left\{\frac{5}{2};-\frac{4}{3}\right\}.\)
Chúc bạn học tốt!
bn tham khao nha
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Ta có: \(\left(2x-5\right)^2\ge0\forall x\) ; \(\left(3y+4\right)^{2014}\ge0\forall y\)
\(\Rightarrow\left(2x-5\right)^{2012}+\left(3y+4\right)^{2014}\ge0\forall x;y\)
Để thỏa mạn đề bài :
\(\Rightarrow\hept{\begin{cases}\left(2x-5\right)^{2012}=0\\\left(3y+4\right)^{2014}=0\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{5}{2}\\y=\frac{-4}{3}\end{cases}}}\)
Vậy............