\(x=\varnothing\)
\(\left(x-2\right)^6=\left(x-2\right)^8\)
\(\Leftrightarrow\left(x-2\right)^6-\left(x-2\right)^8=0\)
\(\Leftrightarrow\left(x-2\right)^6.\left[1-\left(x-2\right)^2\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}\left(x-2\right)^6=0\\1-\left(x-2\right)^2=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x-6=0\\\left(x-2\right)^2=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=6\\x-2=1;x-2=-1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=6\\x=3;x=1\end{cases}}\)
Vậy \(x\in\left\{6;1;3\right\}\)
@@ Học tốt
Chiyuki Fujito
Tái bút : Mà bài này lên lp 7 mk ms đc học đó
(x-2)^6 = (x-2)^6 (x-2)^2
(x-2)^6 [ 1 - (x-2)^2] = 0
Suy ra (x-2)^6 = 0 hay 1 - (x-2)^2 = 0
x - 2 = 0 hay (x-2)^2=1
x - 2 = 0 hay x - 2 = 1 hay x - 2 = -1
x = 2 hay x = 3 hay x = 1
( x - 2 )6 = ( x - 2 )8
( x - 2 )6 - ( x - 2 )8 = 0
( x - 2 )6 - ( x - 2 ) 6 . (x - 2 )2 = 0
( x - 2 ) 6 . [ 1 - ( x - 2 ) 2 ] = 0
* ( x - 2 )6 = 0 * 1 - ( x - 2 ) 2 = 0
x - 2 = 0 ( x - 2 ) 2 = 1
x = 0 + 2 * x - 2 = 1 * x - 2 = -1
x = 2 x = 1 + 2 x = -1 + 2
x = 3 x = 1
Vậy x=2 hoặc x=3 hoặc x=1
Chết r lm lại nhé
\(\left(x-2\right)^6=\left(x-2\right)^8\)
\(\Leftrightarrow\left(x-2\right)^6-\left(x-2\right)^8=0\)
\(\Leftrightarrow\left(x-2\right)^6.\left[1-\left(x-2\right)^2\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}\left(x-2\right)^6=0\\1-\left(x-2\right)^2=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\\left(x-2\right)^2=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=2\\x-2=1;x-2=-1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=2\\x=3;x=1\end{cases}}\)
Vậy \(x\in\left\{2;3;1\right\}\)
Thay cái ngoặc 2 nhánh thành ngoặc 3 nhánh nhé
( x - 2 )6 = ( x - 2 )8
\(\Rightarrow\left(x-2\right)^8-\left(x-2\right)^6=0\)
\(\Rightarrow\left(x-2\right)^2.\left(x-2\right)^6-\left(x-2\right)^6=0\)
\(\Rightarrow\left(x-2\right)^6.\left[\left(x-2\right)^2-1\right]=0\)
\(\Rightarrow\)\(\orbr{\begin{cases}x-2=0\\\left(x-2\right)-1=0\end{cases}}\) \(\Leftrightarrow\)\(\orbr{\begin{cases}x=2\\x=-1\end{cases}}\)
vậy \(x\in\left\{2;-1\right\}\)
15*chia hết cho 3 và 5 là