|x|=-|x+1|
=>|x|+|x+1|=0
\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x+1=0\end{matrix}\right.\Leftrightarrow x\in\varnothing\)
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Tim x,biet;
a/ \(\left(x-1\right)^2=0\)
b/ \(\left(x-2\right)^2-1=0\)
c/\(\left(2x-1\right)^3=-8\)
d/ \(\left(x+2\right)^2+1=0\)
Tìm x biết
a)left(3x+dfrac{1}{3}right)left(x-dfrac{1}{2}right)0
b)left(x-dfrac{3}{2}right)left(2x+1right)0
c)left(2-xright)left(dfrac{4}{5}-xright) 0
d)left(x-dfrac{4}{7}right):left(x+dfrac{1}{2}right)0
e)2left(x+1right)-dfrac{1}{3}.left(x-1right)dfrac{2}{3}
k)left|4x-0,2right|0,2
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Tìm x biết
a)\(\left(3x+\dfrac{1}{3}\right)\left(x-\dfrac{1}{2}\right)=0\)
b)\(\left(x-\dfrac{3}{2}\right)\left(2x+1\right)>0\)
c)\(\left(2-x\right)\left(\dfrac{4}{5}-x\right)< 0\)
d)\(\left(x-\dfrac{4}{7}\right):\left(x+\dfrac{1}{2}\right)>0\)
e)\(2\left(x+1\right)-\dfrac{1}{3}.\left(x-1\right)=\dfrac{2}{3}\)
k)\(\left|4x-0,2\right|=0,2\)
Tìm GTNN của:
a) A left|x-1right|+left|x-2right|+left|x-3right|+left|x-4right|+left|x-5right|
b) B left|x-1right|+left|x-2right|+left|x-3right|+left|x-4right|+left|x-5right|+left|x-6right|
c) C left|x-1right|+left|x-2right|+...+left|x-nright|( n là số lẻ )
d) D left|x-1right|+left|x-2right|+...+left|x-nright|( n là số chẵn )
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Tìm GTNN của:
a) A = \(\left|x-1\right|+\left|x-2\right|+\left|x-3\right|+\left|x-4\right|+\left|x-5\right|\)
b) B = \(\left|x-1\right|+\left|x-2\right|+\left|x-3\right|+\left|x-4\right|+\left|x-5\right|+\left|x-6\right|\)
c) C = \(\left|x-1\right|+\left|x-2\right|+...+\left|x-n\right|\)( n là số lẻ )
d) D = \(\left|x-1\right|+\left|x-2\right|+...+\left|x-n\right|\)( n là số chẵn )
a,P=\(\left(x-4\right)^{\left(x-5\right)^{\left(x-6\right)^{\left(x+6\right)^{\left(x+5\right)}}}}\). Hãy tính giá trị của P với x=7?
b, \(\left(x-1\right)^{x+2}=\left(x-1\right)^{x+4}\)
c, P=\(\left(-1\right)^n.\left(-1\right)^{2n+1}.\left(-1\right)^{n+1}\)
Tìm x : \(\dfrac{1}{x\left(x+1\right)}+\dfrac{1}{\left(x+1\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+3\right)}-\dfrac{1}{x}=\dfrac{1}{2010}\)
Tìm x,y,z \(\in\) Q, biết:
a)\(\left|x+\dfrac{19}{5}\right|+\left|y+\dfrac{1980}{1975}\right|+\left|z-2004\right|=0\)
b) \(\left|\dfrac{3}{4}+x\right|+\left|-\dfrac{1}{5}+y\right|+\left|x+y+z\right|=0\)
a) \(\left|2x-1\right|+\left|x+8\right|=4x\)
b) \(\left(\sqrt{x+1}\right)\left(\sqrt{x-3}\right)=0\)
c) \(3^x+3^{x+2}=2430\)
Bài 1: Tìm x,y,z biết:
a) \(\left|1-2x\right|+\left|2-3y\right|+\left|3-4z\right|=0\)
b) \(x+y=x:y=5\left(x-y\right)\)
Tìm x biết :
a) \(\left|2x+3\right|\) + x = 4
b) \(\left|5x-3\right|=\left|x-7\right|\)
c) \(2.\left|x-1\right|-3x=7\)
d) \(\left|\dfrac{3}{5}-\dfrac{1}{2}x\right|>\dfrac{2}{5}\)