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\(\left|x-2\right|+\left(x^2-2x\right)^{2014}=0\)
Ta có \(\hept{\begin{cases}\left|x+2\right|\ge0\\\left(x^2-2x\right)^{2014}\ge0\end{cases}\forall x}\)
\(\Rightarrow\left|x-2\right|+\left(x^2-2x\right)^{2014}\ge0\forall x\)
Do đó để \(\left|x-2\right|+\left(x^2-2x\right)^{2014}=0\) \(\Leftrightarrow\hept{\begin{cases}\left|x+2\right|=0\\\left(x^2-2x\right)^{2014}=0\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x-2=0\\x^2-2x=0\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x=2\\2^2-2.2=0\end{cases}}\)
\(\Leftrightarrow x=2\)
Vậy x = 2
@@ Học tốt
Chiyuki Fujito
Ta có : x + 4 > x - 9
\(\left\{{}\begin{matrix}x+4>0\\x-9< 0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x>-4\\x< 9\end{matrix}\right.\)<=> -4 < x < 9
\(\left(x+4\right)\left(x-9\right)< 0\\ \Rightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x+4>0\\x-9< 0\end{matrix}\right.\\\left\{{}\begin{matrix}x+4< 0\\x-9>0\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>-4\\x< 9\end{matrix}\right.\\\left\{{}\begin{matrix}x< -4\\x>9\left(ktm\right)\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow-4< x< 9\)
\(\left(x-1\right)^{x+1}-\left(x-1\right)^{x+12}=0\\ \Leftrightarrow\left(x-1\right)^{x+1}\left[1-\left(x-1\right)^{11}\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}\left(x-1\right)^{x+11}=0\\\left(x-1\right)^{11}=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x-1=0\\x-1=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
a) \(2^x\times4=128\)
\(2^x=128:4=32=2^5\)
\(x=5\)
b) \(x^{100}=x\)
\(x^{100}-x=0\)
\(x\left(x^{99}-1\right)=0\)
x=0 hoặc x=1
c) \(\left(2x+1\right)^3=125=5^3\)
\(2x+1=5\)
\(x=2\)
d) \(\left(x-2\right)^{2016}=\left(x-2\right)^{2014}\)
\(\left(x-2\right)^{2014}\left(\left(x-2\right)^2-1\right)=0\)
\(x=0\) hoặc \(\left(x-2\right)^2=1\)
x=0 hoặc x=3 hoặc x=1
a)2x.4=128
2x=128:4=32
=>x=5
b)x100=x
=>x=1
c) (2x+1)3 =125
(2x+1)3=53
=> 2x+1=5
2x=5-1=4
x=4:2
x=2
d) (x-2)2016=(x-2)2014
=> x=2 (vì 2-2=1,mà 1 mũ mấy cũng bằng 1)