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\(\left|2x-1\right|-x=4\Leftrightarrow\left|2x-1\right|=4+x\) (1)
+)TH1: \(2x-1\ge0\Leftrightarrow x\ge\frac{1}{2}\) thì ph(1) trở thành
\(2x-1=4+x\Leftrightarrow x=5\) (tm)
+)TH2: \(2x-1< 0\Leftrightarrow x< \frac{1}{2}\) thì pt(1) trở thành
\(1-2x=4+x\Leftrightarrow-3x=3\Leftrightarrow x=-1\) (tm)
Vậy x={-1;5}
\(\left(x+3\right)\left(2x-4\right)< 0\)
\(\Rightarrow2\left(x+3\right)\left(x-2\right)< 0\)
\(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}x+3>0\\x-2< 0\end{matrix}\right.\\\left[{}\begin{matrix}x+3< 0\\x-2>0\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}x>-3\\x< 2\end{matrix}\right.\\\left[{}\begin{matrix}x< -3\\x>2\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x>-3\\x< 2\end{matrix}\right.\)
\(\Rightarrow-3< x< 2\)
\(\left(x+\frac{2}{3}\right)\left(\frac{5}{4}-2x\right)>0\)
th1 :
\(\hept{\begin{cases}x+\frac{2}{3}>0\\\frac{5}{4}-2x>0\end{cases}\Rightarrow\hept{\begin{cases}x>-\frac{2}{3}\\-2x>-\frac{5}{4}\end{cases}\Rightarrow}\hept{\begin{cases}x>-\frac{2}{3}\\x>\frac{5}{8}\end{cases}\Rightarrow}x>\frac{5}{8}}\)
th2 :
\(\hept{\begin{cases}x+\frac{2}{3}< 0\\\frac{5}{4}-2x< 0\end{cases}\Rightarrow\hept{\begin{cases}x< -\frac{2}{3}\\-2x< -\frac{5}{4}\end{cases}\Rightarrow}\hept{\begin{cases}x< -\frac{2}{3}\\x< \frac{5}{8}\end{cases}\Rightarrow}x< -\frac{2}{3}}\)
vậy_
a)|x+3|-2x=|x-4|
TH1:|x+3|-2x=x-4
|x+3|=x-4+2x
|x+3|=3x-4
đến đây chắc bạn bít làm rồi
TH2:|x+3|-2x=-(x-4)
|x+3|-2x=-x+4
|x+3|=-x+4+2x
|x+3|=x+4
đến đây thì dễ rồi nhé
b)TH1:|x+5|-4=3
|x+5|=3+4=7
TH2:|x+5|-4=-3
|x+5|=-3+4=1
mh chỉ làm đến vậy thôi còn lại thì chắc là dễ rồi
\(\left|x-\dfrac{1}{2}\right|\left|2x-\dfrac{3}{4}\right|=2x-\dfrac{3}{4}\)
\(\left\{{}\begin{matrix}\left|x-\dfrac{1}{2}\right|\ge0\\\left|2x-\dfrac{3}{4}\right|\ge0\end{matrix}\right.\)
\(\Rightarrow2x-\dfrac{3}{4}\ge0\)
\(\Rightarrow\left|2x-\dfrac{3}{4}\right|=2x-\dfrac{3}{4}\)
\(\Rightarrow\left|x-\dfrac{1}{2}\right|=1\)
\(\Rightarrow\left[{}\begin{matrix}x-\dfrac{1}{2}=1\Rightarrow x=\dfrac{3}{2}\\x-\dfrac{1}{2}=-1\Rightarrow x=-\dfrac{1}{2}\end{matrix}\right.\)
\(2x-\dfrac{3}{4}\ge0\Rightarrow2x\ge\dfrac{3}{4}\Rightarrow x\ge\dfrac{3}{2}\)
Vậy xảy ra khi:
\(x=\dfrac{3}{2}\)
`|2x-1|=x+4`
`@TH1:2x-1 >= 0=>x >= 1/2 =>|2x-1|=2x-1`
`=>2x-1=x+4`
`=>x=5` (t/m)
`@TH2:2x-1 < 0=>x < 1/2=>|2x-1|=1-2x`
`=>1-2x=x+4`
`=>3x=-3=>x=-1` (t/m)
Vậy `x in {-1;5}`
Ta có : \(\frac{x}{2}-\frac{x}{3}=-2\)
\(\Leftrightarrow x\frac{1}{2}-x\frac{1}{3}=-2\)
\(\Leftrightarrow x\left(\frac{1}{2}-\frac{1}{3}\right)=-2\)
\(\Leftrightarrow\frac{1}{6}x=-2\)
\(\Rightarrow x=-2.6=-12\)
giai ro ra ho mik di...