|x-1|+|x-4|=3x
<=>x-1+x-4=3x
<=>(x+x)-(1+4)=3x
<=>2x-5=3x
<=>3x-2x=-5
<=>1x=-5
=>x=-5 tick đi ủng hộ mk với ^^
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tim x biet:a)/x+1/+/3x-1/+/x-1/=3
b)/x-2/+/x-7/=4
Bai 1: Tim x
a) \(|\text{x-1|+|2x+4|=3}\)
b) \(|x+\dfrac{1}{3}|=|3x-\dfrac{5}{6}|\)
c) 4x.\(\left(x+\dfrac{1}{2}\right)=0\)
d) 3x.(x+2)-5(x+2)=0
Bai 1. Tim x, y biet
a. \(\left|2-3x\right|=\left|3x+5\right|\)
b. \(\dfrac{x+1}{7}=\dfrac{y-2}{5}\)va 3x-2y=4.
Tim X
a,\(\left|2x+3\right|-2\left|4-x\right|=5\)
b, \(\left|x-1\right|+\left|x+3\right|=4\)
c, \(\left|x+3\right|+\left|x+1\right|=3x\)
Tim gtnn
\(A=\dfrac{3x^2+14}{x^2+4}\)
\(B=\dfrac{2x+1}{x^2+2}\)
Tim gtln cua tong x+y+z
y+5y=21 ; 2x+3z=51 ( x,y,z\(\ge\)0)
tim x,y,z (cau a ) , tim x , y (cau b )
a, x : y : z = 3 : 4 : 5 va 5z2 - 3x2 - 2y2 = 594
b, z + y = x : y = 3.(x - y )
Tim x:
\1/2x + 3\ = \1/3x+2\
tim nghiem cua da thuc:
M(x)=(6-3x)(-2x+5)
N(x)=x^2+x
A(x)=3x-3
tim GTNN,GTLN cua F=2/3x-2/-1 G=x^2+3/y-2/-1