(x - 4)2 = (x - 4)4
=> (x - 4)4 - (x - 4)2 = 0
=> (x - 4)2.[(x - 4)2 - 1] = 0
=> \(\left[\begin{array}{nghiempt}\left(x-4\right)^2=0\\\left(x-4\right)^2-1=0\end{array}\right.\)=> \(\left[\begin{array}{nghiempt}x-4=0\\\left(x-4\right)^2=1\end{array}\right.\)=> \(\left[\begin{array}{nghiempt}x=4\\x-4\in\left\{1;-1\right\}\end{array}\right.\)
=> \(\left[\begin{array}{nghiempt}x=4\\x\in\left\{5;3\right\}\end{array}\right.\)
Vậy \(x\in\left\{3;4;5\right\}\)
\(\left(x-4\right)^2=\left(x-4\right)^4\)
\(\Rightarrow\left(x-4\right)^2-\left(x-4\right)^4=0\)
\(\Rightarrow\left(x-4\right)^2.\left[1-\left(x-4\right)^2\right]=0\)
+) \(\left(x-4\right)^2=0\Rightarrow x-4=0\Rightarrow x=4\)
+) \(1-\left(x-4\right)^2=0\Rightarrow\left(x-4\right)^2=1\Rightarrow x-4=\pm1\)
+ \(x-4=1\Rightarrow x=5\)
+ \(x-4=-1\Rightarrow x=3\)
Vậy \(x\in\left\{4;5;3\right\}\)
mik có câu khác đó bạ làm đước..
cua bò tổng cộng mấy chaan^-6
