Tim x biết I 2x - 1 I -x = 4
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Những câu hỏi liên quan
Tim x:
2x-/x+1/=-1/2
\(2x-\left|x+1\right|=-\frac{1}{2}\)
=> \(\left|x+1\right|=2x-\left(-\frac{1}{2}\right)\)
=> \(\left|x+1\right|=2x+\frac{1}{2}\)
=> \(\left[{}\begin{matrix}x+1=2x+\frac{1}{2}\\x+1=-\left(2x+\frac{1}{2}\right)\end{matrix}\right.\) => \(\left[{}\begin{matrix}x-2x=\frac{1}{2}-1\\x+1=-2x-\frac{1}{2}\end{matrix}\right.\)
=> \(\left[{}\begin{matrix}-1x=-\frac{1}{2}\\x+2x=\left(-\frac{1}{2}\right)-1\end{matrix}\right.\) => \(\left[{}\begin{matrix}x=\left(-\frac{1}{2}\right):\left(-1\right)\\3x=-\frac{3}{2}\end{matrix}\right.\)
=> \(\left[{}\begin{matrix}x=\frac{1}{2}\\x=\left(-\frac{3}{2}\right):3\end{matrix}\right.\) => \(\left[{}\begin{matrix}x=\frac{1}{2}\\x=-\frac{1}{2}\end{matrix}\right.\)
Vậy \(x\in\left\{\frac{1}{2};-\frac{1}{2}\right\}.\)
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Bình luận (2)
\(2x-\left|x+1\right|=-\frac{1}{2}\)
\(\Leftrightarrow\left|x+1\right|=2x+\frac{1}{2}\)
\(\Leftrightarrow\left[{}\begin{matrix}x+1=2x+\frac{1}{2}\\x+1=-\left(2x+\frac{1}{2}\right)\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{1}{2}\\x+1=-2x-\frac{1}{2}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{1}{2}\\3x=-\frac{3}{2}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{1}{2}\\x=-\frac{1}{2}\end{matrix}\right.\)
Vậy : \(x\in\left\{\frac{1}{2},-\frac{1}{2}\right\}\)
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Bình luận (1)
tim x biet :
a) ( 2x^2+4 ) - (x^2-3/2 ) = (-3+4x^2)+ ( -4x^2/3+1)
b) ( I xI -4) - ( 2- I-xI ) = 1/3 . I xI -5
Tim x, biet: I 2x-1 I + I 1-2x I = 8
Bài 60: Tìm x; biết
a/ I x+1 I + I x + 2 I + ..... + I x + 100 I = 101x
b/ I x+ 1/1.2 I + I x + 1/2.3 I + ..... + I x + 1/99.100 I = 100x
c/I I 2x-1 I-1/2 I = 3/2
d/I I 3/2x - 2 I -5/2 I = 3/4
e/I x2 + 2018 I 2019x -1 I I = x2 + 2018
f/ I (x + 1/2 ) I 2x - 3/4 II = 2x -3/4
I. tim xyeZ bt:
a) -(x+3)^2-|y+7|>=0
2.tim x bt
(X+4)chia het (2x+1)
Tìm x biết I ( x + 1/2 ) I 2x - 3/4 II = 2x - 3/4
tim x biet :
a) ( 2x2+4 ) - (x2-3/2 ) = (-3+4x2)+ ( -4x2/3+1)
b) ( I xI -4) - ( 2- I-xI ) = 1/3 . I xI -5
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Bình luận (0)
tim x biet :
a) ( 2x2+4 ) - (x2-3/2 ) = (-3+4x2)+ ( -4x2/3+1)
b) ( I xI -4) - ( 2- I-xI ) = 1/3 . I xI -5
1, Tìm x thuộc Z biết :
a,2x - ( -5) = x- 4
b,- ( 2x+3) -x =2x -(- 3- 6)
c, (2x -3) -(2x +5) =6
d, I x I =3
e, I x -1 I-1 =3
g, Ix +1 =3 ( a thuộc Z )