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(2x-1)2008+(y+3.1)2008=0
ĐK: \(\hept{\begin{cases}\left(2x-1\right)^{2008}\ge0\\\left(y+3.1\right)^{2008}\ge0\end{cases}}\Rightarrow\left(2x-1\right)^{2008}+\left(y+3\right)^{2008}\ge0\)
\(\Rightarrow\hept{\begin{cases}\left(2x-1\right)^{2008}=0\\\left(y+3\right)^{2008}=0\end{cases}}\Rightarrow\hept{\begin{cases}2x-1=0\\y+3=0\end{cases}}\Rightarrow\hept{\begin{cases}x=\frac{1}{2}\\y=-3\end{cases}}\)
Vậy x=1/2 và y=-3
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=) (2x-1)^2008=0
(y-2/5)^2008=0
/x+y+z/=0=)x+y+z=0
- (2x-1)^2008=0
=)2x-1=0
2x=1
x=1/2
tuong tu ta se tih duoc y
thay vao ta se tih duoc z
duyet nha
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tìm x bt :
a, ( 2x + 1 )4 = ( 2x + 1 )6
=>(2x+1)4-(2x+1)6=0
=>(2x+1)4-(2x+1)4.(2x+1)2=0
=>(2x+1)4.[1-(2x+1)2]=0
=>(2x+1)4=0 hoặc 1-(2x+1)2=0
=>2x+1=0 hoặc(2x+1)2=1
=>2x=-1 hoặc(2x+1)2=12
=>x=\(\dfrac{-1}{2}\) hoặc 2x+1=1 =>2x=0 => x=0
Vậy x∈{0;\(\dfrac{-1}{2}\)}
Bài 2:
\(\left(3x-5\right)^{2006}+\left(y^2-1\right)^{2008}+\left(x-z\right)^{2100}=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}3x-5=0\\y^2-1=0\\x=z\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=z=\dfrac{5}{3}\\y\in\left\{1;-1\right\}\end{matrix}\right.\)
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Ta có :
\(\left(2x-1\right)^{2008}\ge0\forall x\)
\(\left(y+3x\right)^{2008}\ge0\forall x;y\)
\(\left(2x-1\right)^{2008}+\left(y+3x\right)^{2008}=0\)
\(\Leftrightarrow\hept{\begin{cases}2x-1=0\\y+3x=0\end{cases}}\)
\(\hept{\begin{cases}2x=1\\y+3x=0\end{cases}}\)
\(\hept{\begin{cases}x=\frac{1}{2}\\y+3\cdot\frac{1}{2}=0\end{cases}}\)
\(\hept{\begin{cases}x=\frac{1}{2}\\y+\frac{3}{2}=0\end{cases}}\)
\(\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{-3}{2}\end{cases}}\)
( 2x - 1 )2008 + ( y + 3x )2008 = 0
Ta có : \(\hept{\begin{cases}\left(2x-1\right)^{2008}\\\left(y+3x\right)^{2008}\end{cases}\ge}0\forall x,y\Rightarrow\left(2x-1\right)^{2008}+\left(y+3x\right)^{2008}\ge0\forall x,y\)
Đẳng thức xảy ra <=> \(\hept{\begin{cases}2x-1=0\\y+3x=0\end{cases}}\)
+) 2x - 1 = 0 => x = 1/2
+) y + 3x = 0
=> y + 3.1/2 = 0
=> y + 3/2 = 0
=> y = -3/2
Vậy giá trị của biểu thức = 0 <=> x = 1/2 ; y = -3/2