\(\left(x-7\right)^{x+1}-\left(x-7\right)^{x+11}=0\)
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\(\Rightarrow\left(x-7\right)^{x+1}\left[1-\left(x-7\right)^{10}\right]=0\\ \Rightarrow\left[{}\begin{matrix}\left(x-7\right)^{x+1}=0\\1-\left(x-7\right)^{10}=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x-7=0\\\left(x-7\right)^{10}=1\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=7\\x=8\end{matrix}\right.\)
\(\Leftrightarrow\left(x-7\right)\left(x-6\right)\left(x-8\right)=0\)
hay \(x\in\left\{6;7;8\right\}\)
\(\Leftrightarrow\left(x-7\right)^{x+1}\left[1-\left(x-7\right)^{10}\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}\left(x-7\right)^{x+1}=0\\\left(x-7\right)^{10}=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x-7=0\\x-7=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=7\\x=8\end{matrix}\right.\)
\(\left(x-7\right)^{x+1}-\left(x-7\right)^{x+11}=0\)
\(\Rightarrow\left(x-7\right)^{x+1}\left[1-\left(x-7\right)^{10}\right]=0\)
\(\Rightarrow\left(x-7\right)^{x+1}\left[1^2-\left(x-7\right)^{5^2}\right]=0\)
\(\Rightarrow\left(x-7\right)^{x+1}\left[1-\left(x-7\right)^5\right]\left[1+\left(x-7\right)^5\right]=0\)
=>(x-7)x+1=0 hoặc 1-(x-7)5=0 hoặc 1+(x-7)5=0
+)Nếu (x-7)x+1=0
=>x-7=0
=>x=7
+)Nếu 1-(x-7)5=0
=>(x-7)5=1
=>x-7=1
=>x=8
+)Nếu 1+(x-7)5=0
=>(x-7)5=-1
Vì \(\left(x-7\right)^5\ge0\) với mọi x
=>không tìm được x thỏa mãn 1+(x-7)5=0
Vậy x=7 hoặc x=8
\(\left|x-\frac{1}{3}\right|+\frac{4}{5}=\left|\frac{-14}{5}\right|\)
\(\left|x-\frac{1}{3}\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x-\frac{1}{3}=2\\x-\frac{1}{3}=-2\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{7}{3}\\-\frac{5}{3}\end{cases}}}\)
Vậy...
=> (x-7)^x+1 + 1.[1-(x-7)^10] = 0
=> x-7 = 0 hoặc 1-(x-7)^10 = 0
=> x=7 hoặc x = 8 hoặc x = 6
k mk nha
=> (x-7)x+1(1 - (x-7)10) = 0
=> (x-7)x+1 = 0
=> x-7 = 0 => x = 7
hoặc 1 - (x-7)10 = 0
=> (x-7)10 = 1
=> x-7 = 1
=> x = 8
\(\left(x-7\right)^{x+1}-\left(x-7\right)^{x+11}=0\)
\(\Leftrightarrow\left(x-7\right)^{x+1}.\left[1-\left(x-7\right)^{10}\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}\left(x-7\right)^{x+1}=0\\1-\left(x-7\right)^{10}=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x-7=0\\\left(x-7\right)^{10}=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=7\\x=8\end{cases}}\)
\(\Rightarrow\left[x-7\right]^{x+1}\left[1-\left[x-7\right]^{10}\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left[x-7\right]^{x+1}=0\\1-\left[x-7\right]^{10}=0\end{cases}\Rightarrow}\orbr{\begin{cases}x-7=0\\1-\left[x-7\right]^{10}=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=7\\x-7=1\Rightarrow x=8\end{cases}}\)