a) |2x+3|=x+2
=>2x+3=x+2 hay 2x+3=-x-2
2x-x=2-3 hay 2x+x=-2-3
x = -1 hay 3x = -5
x=-1 hay x = -5/3
Vậy x=-1;x=-5/3
b). |3-x|=1-3x
=> 3-x=1-3x hay 3-x=-1+3x
-x+3x=1-3 hay -x-3x=-1-3
2x =-2 hay -4x = -4
x= -1 hay x=1
Vậy x=-1;x=1
c). |x-1/5|=1/5-x
=>x-1/5=1/5-x hay x-1/5=-1/5+x
x+x=1/5+1/5 hay x-x=-1/5+1/5(=0)
2x = 2/5
x=1/5
Vậy x=1/5
Tìm x biết:
a) |2x+3|=x+2
b) |3-x|=1-3x
c) |x-\(\frac{1}{5}\)|=\(\frac{1}{5}\)-x
d) (x-5)x+1=(x-5)x+11
e) 2010-|x-2010|=0
f) |3x-4|+|3x+5|=-9
Tìm x, y, z biết rằng:
a) \(\frac{x-y}{3}=\frac{x+y}{2}=\frac{1}{2}\)
b) \(\frac{2x-5}{y+1}=\frac{x-1}{3y}=\frac{1}{3}\)
c) \(\frac{2x+5}{5}=\frac{y+6}{4}\) và 5x - 3y = -64
Bài 4.1: Tìm x, biết
a) \(4\left|3x-1\right|+\left|x\right|-2\left|x-5\right|+7\left|x-3\right|=12\)
b) \(3\left|x+4\right|-\left|2x+1\right|-5\left|x+3\right|+\left|x-9\right|=5\)
c) \(\left|2\frac{1}{5}-x\right|+\left|x-\frac{1}{5}\right|+8\frac{1}{5}=1,2\)
d) \(2\left|x+3\frac{1}{2}\right|+\left|x\right|-3\frac{1}{2}=\left|2\frac{1}{5}-x\right|\)
tìm x , y , z biết :
a ) 3x = 2y , 7y = 5z , x - y + z = 32
b ) \(\frac{2x}{3}=\frac{3y}{4}=\frac{4z}{5}\) và x + y + z = 49
c ) \(\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}\) và 2x + 3y - z = 50
Tìm x,y biết:
\(\frac{x+1}{4}=\frac{2x-3}{5}=\frac{3x-2}{9y}\)
Tìm x, y, z biết rằng:
a) \(\frac{x-y}{3}=\frac{x+y}{2}=\frac{1}{2}\)
b) \(\frac{2x-5}{y+1}=\frac{x-1}{3y}=\frac{1}{3}\)
\(\left|x+\frac{1}{2}\right|+\left|x+\frac{1}{6}\right|+\left|x+\frac{1}{12}\right|+\left|x=\frac{1}{20}\right|+...+\left|x+\frac{1}{101}\right|=101x\)
2. Tìm x, y, z biết\(\left(2x+1\right)^{2008}+\left(y-\frac{2}{5}\right)^{2008}+\left|x+y+z\right|=0\)
3.Tìm x\(a,2009-\left|x-2009\right|=x\)
\(b,\left|3x+2\right|=\left|5x-3\right|\)
Tìm x , y , z biết
a ) \(\frac{2x-1}{5}=\frac{3y+2}{4}=\frac{4z-3}{5}\) và 2x - 3y + 4z = 9
b ) \(\frac{x-1}{5}=\frac{y-2}{6}=\frac{z-3}{7}\) và xyz = 1
Tìm x biết:
a) |x| + 32 = 22 + (1/2)3
b) (2x + 1)3 = - 8
c) \(5-\left|x+\frac{1}{2}\right|=2^2-\left(\frac{1}{2}\right)^3\)
