Tìm x thuộc z biết
a)2+3x= -15-19
b) 7-IxI .(2x-4)=0
c) Ix+1I -3=0
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a) \(\Rightarrow\left(x-2\right)\left(x+1\right)=0\Rightarrow\left[{}\begin{matrix}x=2\\x=-1\end{matrix}\right.\)
b) \(\Rightarrow\left(x-3\right)\left(5x-1\right)=0\Rightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{1}{5}\end{matrix}\right.\)
c) \(\Rightarrow\left[{}\begin{matrix}x=-\dfrac{5}{3}\\x=\dfrac{4}{3}\end{matrix}\right.\)
d) \(\Rightarrow\left(x-7\right)\left(3x-2\right)=0\Rightarrow\left[{}\begin{matrix}x=7\\x=\dfrac{2}{3}\end{matrix}\right.\)
\(a,\Leftrightarrow\left(x-2\right)\left(x+1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-1\end{matrix}\right.\\ b,\Leftrightarrow\left(x-3\right)\left(5x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{1}{5}\end{matrix}\right.\\ c,\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{5}{3}\\x=\dfrac{4}{3}\end{matrix}\right.\\ d,\Leftrightarrow\left(x-7\right)\left(3x-2\right)=0\Leftrightarrow\left[{}\begin{matrix}x=7\\x=\dfrac{2}{3}\end{matrix}\right.\)
`2x-15 = 17``
`=> 2x = 17 + 15`
`=> 2x = 32`
`=> X = 32 : 2`
`=> x = 16`
`156 - (x + 61) = 82`
`=> x + 61 = 156 - 82`
`=> x + 61 = 74`
`=> x = 13`
`2x - 138 = 2^3 . 3^2`
`=>2x - 138 = 72`
`=> 2x = 210`
`=> x = 105`
bài 2:
`23-3x = 8`
`=> 3x = 23 - 8`
`=> 3x = 15`
`=> x = 5`
`(x-35) - 120 = 0`
`=>(x-35) = 120`
`=> x = 120 +35`
`=> x = 155`
`3^x + 2 = 29`
`=> 3^x = 27`
`=> 3^x = 3^3`
`=> x = 3`
\(2+3x=-15-19\)
\(\Rightarrow3x=-15-19-2\)
\(\Rightarrow3.x=-36\)
\(\Rightarrow x=-13\)
\(7-\left|x\right|\left(2x-4\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}7-\left|x\right|=0\\2x-4=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\left|x\right|=7\\2x=4\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\pm7\\x=2\end{cases}}\)
\(\left|x+1\right|-3=0\)
\(\Rightarrow\left|x+1\right|=3\)
\(\Leftrightarrow\orbr{\begin{cases}x+1=3\\x+1=-3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=2\\x=-4\end{cases}}\)
c;
/x+1/ -3 =0
/x+1/ = 0+ 3
/x+1/ = 3
ta chia làm 2TH
TH1 x+1 = 3
x = 3-1
x = 2
TH2 x+1=-3
x = -3 -1
x = -4
vậy \(x\in\left\{2;-4\right\}\)