\(\left(2x-1\right)^{2008}\ge0\)

\(\left(y-\frac{2}{5}\right)^{2008}\ge0\)

\(\left|x+y+z\right|\ge0\)

\(\Rightarrow\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y+z\right|\ge0\)

Mà: \(\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y+z\right|=0\)

\(\Rightarrow\left(2x-1\right)^{2008}=0;\left(y-\frac{2}{5}\right)^{2008}=0;\left|x+y+z\right|=0\)

\(\Rightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=\frac{-9}{10}\end{cases}}\)

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        Bằng Chíu ! Bằng Chíu !

(2x - 1 )²⁰⁰⁸+(y - 2/5)²⁰⁰⁸ + |x + y - z | = 0

=> ( 2x - 1) ²⁰⁰⁸ =0                     => 2x - 1 =0                => 2x = 1                       => x = 1/2 

     ( y - 2/5 )²⁰⁰⁸ = 0                        y - 2/5 = 0                   y =2/5                           y = 2/5

     |x + y -z | = 0                             x + y - z = 0                x + 2/5 - z = 0                1/2 - 2/5  -z = 0 

=>x = 1/2              =>x = 1/2

    y = 2/5                  y = 2/5

    5/10 - 4/10 = z       z = 1/ 10

                                                                 Vậy x = 1/2 ; y = 2/5 : z = 1/10

( nhớ cho mk nha )

ta có: \(\left(2x-1\right)^{2008}\ge0\)

\(\left(y-\frac{2}{5}\right)^{2008}\ge0\)

\(\left|x+y-z\right|\ge0\)

\(\Rightarrow\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y-z\right|\ge0\)

để \(\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y-z\right|=0\)

\(\Rightarrow\left(2x-1\right)^{2008}=0\Rightarrow2x-1=0\Rightarrow x=\frac{1}{2}\)

\(\left(y-\frac{2}{5}\right)^{2008}=0\Rightarrow y-\frac{2}{5}=0\Rightarrow\frac{2}{5}\)

\(\left|x+y-z\right|=0\Rightarrow x+y-z=0\Rightarrow z=x+y\Rightarrow z=\frac{1}{2}+\frac{2}{5}=\frac{9}{10}\)

KL: x= 1/2; y= 2/5; z=9/10

( mk nghĩ nó còn có nhiều đáp số lắm, nhưng mk ko bít cách lm)

Do (2x-1)²⁰⁰⁸\(\ge0\),\(\left(y-\frac{2}{5}\right)^{2008}\ge0\),|x+y-z|\(\ge0\)

mà đề cho tổng 3 số trên bằng 0

\(\Rightarrow\hept{\begin{cases}\left(2x-1\right)^{2008}\\\left(y-\frac{2}{5}\right)^{2008}\\\left|x+y-z\right|=0\end{cases}\Rightarrow\hept{\begin{cases}2x=-1\\y=\frac{2}{5}\\x+y-z=0\end{cases}}}\)

\(\Rightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\\frac{1}{2}+\frac{2}{5}-z=0\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=\frac{9}{10}\end{cases}}}\)

Vậy ...(bn tự kl nhé)

ta có: \(\left(\text{2x − 1}\right)^{2018}\) ≥ 0

\(\left(y-\frac{2}{5}\right)^{2018}\) ≥ 0

\(\left|x+y-z\right|\) ≥ 0

⇒ \(\left(\text{2x − 1 }\right)^{2018}\)+ \(\left(y-\frac{2}{5}\right)^{2018}\) +\(\left|\text{ x + y − z }\right|\) ≥ 0

để \(\left(\text{2x − 1}\right)^{2018}\) + \(\left(y-\frac{2}{5}\right)^{2018}\) + \(\left|\text{x + y − z}\right|\) = 0

⇒ \(\left(\text{2x − 1}\right)^{2018}\) = 0 ⇒ 2x − 1 = 0 ⇒ x = \(\frac{1}{2}\)

\(\left(y-\frac{2}{5}\right)^{2018}\) = 0 ⇒ y − \(\frac{2}{5}\) = 0⇒ \(\frac{2}{5}\)

\(\left|\text{x + y − z}\right|\) = 0 ⇒ x + y − z = 0 ⇒ z = x + y ⇒z = \(\frac{1}{2}\) + \(\frac{2}{5}\) = \(\frac{9}{10}\)

KL: x = \(\frac{1}{2}\); y = \(\frac{2}{5}\); z = \(\frac{9}{10}\)

( mình nghĩ nó còn có nhiều đáp số lắm, nhưng mình ko biết cách làm)

Chúc bạn học có hiệu quả!

a: =>|x-2009|=2009-x

=>x-2009<=0

=>x<=2009

b: =>2x-1=0 và y-2/5=0 và x+y-z=0

=>x=1/2 và y=2/5 và z=x+y=1/2+2/5=5/10+4/10=9/10

a)/x-2009/=2009-x

TH1:x-2009=2009-x=>x=2009

TH2:x-2009=-(2009-x)=>x-2009=x-2009 đúng với mọi x

b) (2x-1)^2008>=0

(y-2/5)^2008>=0

/x-y-z/>=0

=>2x-1=0

y-2/5=0

x-y-z=0(cái này dùng ngoặc nhọn)

=>x=1/2;y=2/5;z=1/10

\(a)\) \(2009-\left|x-2009\right|=x\)

\(\Leftrightarrow\)\(\left|x-2009\right|=2009-x\)

Ta có : \(\left|x-2009\right|\ge0\)

\(\Rightarrow\)\(2009-x\ge0\)

\(\Rightarrow\)\(x\le2009\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}x-2009=2009-x\\x-2009=x-2009\end{cases}\Leftrightarrow\orbr{\begin{cases}x+x=2009+2009\\x=x\end{cases}}}\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}2x=4018\\x=x\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2009\\x=x\end{cases}}}\)

Vậy \(x=2009\)

Chúc bạn học tốt ~ 

\(b)\) \(\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y-z\right|=0\)

\(\Leftrightarrow\)\(\hept{\begin{cases}\left(2x-1\right)^{2008}=0\\\left(y-\frac{2}{5}\right)^{2008}=0\\\left|x+y-z\right|=0\end{cases}\Leftrightarrow\hept{\begin{cases}2x-1=0\\y-\frac{2}{5}=0\\x+y-z=0\end{cases}}}\)

\(\Leftrightarrow\)\(\hept{\begin{cases}2x=1\\y=\frac{2}{5}\\z=x+y\end{cases}\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=\frac{1}{2}+\frac{2}{5}\end{cases}}}\)

\(\Leftrightarrow\)\(\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=\frac{9}{10}\end{cases}}\)

Vậy nghiệm của phương trình là \(\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=\frac{9}{10}\end{cases}}\)

Chúc bạn học tốt ~ 

(2x-1)²⁰⁰⁸ \(\ge\) 0 với mọi x

(y-2/5)²⁰⁰⁸ \(\ge\) 0 với mọi y

|x+y+z| \(\ge\) 0 với mọi x;y;z

=>(2x-1)²⁰⁰⁸+(y-2/5)²⁰⁰⁸+|x+y+z| \(\ge\) 0 với mọi x;y;z

Mà (2x-1)²⁰⁰⁸+(y-2/5)²⁰⁰⁸+|x+y+z| = 0 (theo đề)

=>(2x-1)²⁰⁰⁸+(y-2/5)²⁰⁰⁸=|x+y+z|=0

+)(2x-1)²⁰⁰⁸=0=>2x-1=0=>2x=1=>x=1/2

+)(y-2/5)²⁰⁰⁸=0=>y-2/5=0=>y=2/5

+)|x+y+z|=0=>x+y+z=0=>(1/2+2/5)+z=0=>9/10+z=0=>z=-/910

Vậy x=1/2;y=2/5;z=-9/10

Hoàng Phúc very PRO

\(\left(2x-1\right)^{2008}+\left(y-\dfrac{2}{5}\right)^{2008}+\left|x+y+z\right|=0\)

Nhận xét : \(\left\{{}\begin{matrix}\left(2x-1\right)^{2008}\ge0\forall x\\\left(y-\dfrac{2}{5}\right)^{2008}\ge0\forall y\\\left|x+y+z\right|\ge0\forall x,y,z\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\left(2x-1\right)^{2008}=0\\\left(y-\dfrac{2}{5}\right)^{2008}=0\\\left|x+y+z\right|=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=\dfrac{2}{5}\\z=-\dfrac{9}{10}\end{matrix}\right.\)

\(\left(2x-1\right)^{2008}\ge0với\forall x\) mà,\(\left(y-\frac{2}{5}\right)^{2008}\ge0với\forall y\)lại có\(|x+y+z|\ge0với\forall x,y,z\)

\(\Rightarrow\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y+z\right|\ge0với\forall x,y,z\)Dấu ''='' xảy ra khi \(\hept{\begin{cases}2x-1=0\\y-\frac{2}{5}=0\\x+y+z=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=-\frac{9}{10}\end{cases}}}\)

\(\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)+\left|x+y+z\right|=0\)

Ta có \(\hept{\begin{cases}\left(2x-1\right)^{2008}\ge0\forall x\\y-\frac{2}{5}\ge0\forall y\\\left|x+y+z\right|\ge0\forall x;y;z\end{cases}}\)

 => \(\left(2x-1\right)^{2008}+\left(y-\frac{2}{5}\right)+\left|x+y+z\right|\ge0\forall x;y;z\)

Dấu "=" xảy ra <=> \(\hept{\begin{cases}\left(2x-1\right)^{2008}=0\\y-\frac{2}{5}=0\\\left|x+y+z\right|=0\end{cases}}\)

                         \(\Leftrightarrow\hept{\begin{cases}2x-1=0\\y=\frac{2}{5}\\x+y+z=0\end{cases}}\)

                        \(\Leftrightarrow\hept{\begin{cases}2x=1\\y=\frac{2}{5}\\x+y+z=0\end{cases}}\)

                          \(\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\x+y+z=0\end{cases}}\)

                         \(\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{2}{5}\\z=0-\frac{1}{2}-\frac{2}{5}=\frac{-5}{10}-\frac{4}{10}=\frac{-9}{10}\end{cases}}\)

Vậy \(x=\frac{1}{2};y=\frac{2}{5};z=\frac{-9}{10}\)

Học tốt

(2x-1)^2008\(\ge\)0

(y-2/5)^2008\(\ge\)0

|x+y+z|\(\ge\)0

\(\Rightarrow\)(2x-1)^2008+(y-2/5)^2008+|x+y+z|\(\ge\)0

mà (2x-1)^2008+(y-2/5)^2008+|x+y+z|=0

\(\Rightarrow\)(2x-1)^2008=0;(y-2/5)^2008=0;|x+y+z|=0

x=1/2;y=2/5;z=-9/10

Kết quả là x=1/2;y=2/5;z=-9/10