Tìm x biết
\(\left(2x-1\right)^6=\left(2x-1\right)^8\)
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giống cái kia thôi bn
Mik làm rồi mà
Mà cái bn Nguyễn Duy Đạt gì đó làm thiếu 1 trường hợp
Mà bn vẫn kik hở
Sao zzzzz??????
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\(VT=\left|2x+3\right|+\left|2x-1\right|=\left|2x+3\right|+\left|1-2x\right|\ge\left|2x+3+1-2x\right|=\left|4\right|=4\)
\(VP=\frac{8}{3\left(x+1\right)^2+2}\le\frac{8}{2}=4\)
\(VT\ge VP\)
Dấu "=" xảy ra \(\Leftrightarrow\)\(\hept{\begin{cases}\left(2x+3\right)\left(1-2x\right)\ge0\left(1\right)\\\left(x+1\right)^2=0\left(2\right)\end{cases}}\)
\(\left(2\right)\)\(\Leftrightarrow\)\(x=-1\) ( thỏa mãn\(\left(1\right)\) )
...
Ta có: \(\left(2x-1\right)^6=\left(2x-1\right)^8\)
=> \(\left(2x-1\right)\in\left\{1;-1;0\right\}\)
* Nếu 2x - 1 = 1
=> 2x = 2
=> x = 2 : 2 = 1
* Nếu 2x - 1 = -1
=> 2x = (-1) + 1
=> 2x = 0
=> x = 0 : 2 = 0
* Nếu 2x - 1 = 0
=> 2x = 0 + 1
=> 2x = 1
=> x = 1 : 2
=> x = 1/2
Vậy x = { 1; 0 ; 1/2 } thì \(\left(2x-1\right)^6=\left(2x-1\right)^8\)
CHÚC BẠN HỌC TỐT
( 2x - 1 )6 = ( 2x - 1 )8
( 2x - 1 )8 - ( 2x - 1 )6 = 0
( 2x - 1 )6 . ( ( 2x - 1 )2 - 1 ) ) = 0
Vậy ( 2x - 1 )6 = 0 hoặc ( 2x - 1 )2 - 1 = 0
2x - 1 = 0 hoặc \(\orbr{\begin{cases}2x-1=1\\2x-1=-1\end{cases}}\)
x=1/2 hoặc \(\orbr{\begin{cases}x=1\\x=0\end{cases}}\)
Vậy x \(\in\){ 1/2; 0 ;1 }
\(c,\Rightarrow\left[{}\begin{matrix}-2\left(x+2\right)+\left(4-x\right)=11\left(x< -2\right)\\2\left(x+2\right)+\left(4-x\right)=11\left(-2\le x\le4\right)\\2\left(x+2\right)+\left(x-4\right)=11\left(x>4\right)\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{11}{3}\left(tm\right)\\x=3\left(tm\right)\\x=\dfrac{11}{3}\left(ktm\right)\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=-\dfrac{11}{3}\end{matrix}\right.\)
\(a,\Rightarrow\left[{}\begin{matrix}x+\dfrac{5}{2}=3x+1\\x+\dfrac{5}{2}=-3x-1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{4}\\x=-\dfrac{7}{8}\end{matrix}\right.\)
x=1 và 0
ms thỏa mản đề ra
=)))))))))))))))
\(\left(2x-1\right)^6=\left(2x-1\right)^8\)
\(\Leftrightarrow\left(2x-1\right)^6-\left(2x-1\right)^8=0\)
\(\Leftrightarrow\left(2x-1\right)^6\left[1-\left(2x-1\right)^2\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}\left(2x-1\right)^6=0\\1-\left(2x-1\right)^2=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=1\\2x-1=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{2}\\2x=2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{2}\\x=1\end{cases}}\)