3/x - 4 = x + 4/3
3/x - x = -4/3+4
3 - x2/x = 8/3
3-x = 8/3
x= 3 - 8/3
x=1/3
\(\frac{3}{x-4}=\frac{x+4}{3}\Rightarrow9=\left(x-4\right)\left(x+4\right)\)
\(\Rightarrow\) \(9=x-16hayx-16=9\)
\(\Rightarrow x=9-16\)
\(\Rightarrow x=-5\)
vậy x=-5
Tìm x:
a) x/6 = 7/4
b) 3/x = 21/17
c) 125x = 25/3
d) -3/x = 15/7
e) 0,1/5 = x//15
f) -4/1,2 = x/-3,6
g) -2,6/12 = x/-42
h) 21/14 = 33/x
i) 1,4/-5 = 2,1/x
k) 0,12/3 = 0,21/x
l) x-2/3 = 4/5
n) x+3/-4 = 5/12
m) 3/ x-1 = 21/16
Cho các số thực a, b, c thỏa mãn: 4*b*z - 5*x*y / 3*a = 5*c*x - 3*a*z / 4*b = 3*a*y - 4*b*x / 5*c. Chứng minh rằng: x/3*a = y/4*b = z/5*c
5: Tìm x biết a) x/3 =4/12 b) x-1/ x-2=3/5 c) 2x :6=1/4 d) x² +x/2x²+1=1/2
Tìm x biết :
a) \(\frac{-5}{7}\)-\((\frac{1}{2}-x)\)=\(\frac{-11}{4}\)
b)\((2x-1)^2-5=20\)
c)\(\left(\frac{3}{4}x+3\right)-\left(\frac{2}{3}x-4\right)-\left(\frac{1}{6}x+1\right)=\left(\frac{1}{3}x+4\right)-\left(\frac{1}{3}x-3\right)\)
d)\(\frac{x-6}{4}=\frac{4}{x-6}\)
e)\(\frac{2x-1}{3}=\frac{-27}{1-2x}\)
f)\(\left(x-1\right)^{x+2}=\left(x-1\right)^2\)
Tìm x biết :
a) \(\frac{-5}{7}\)-\((\frac{1}{2}-x)\)=\(\frac{-11}{4}\)
b)\((2x-1)^2-5=20\)
c)\(\left(\frac{3}{4}x+3\right)-\left(\frac{2}{3}x-4\right)-\left(\frac{1}{6}x+1\right)=\left(\frac{1}{3}x+4\right)-\left(\frac{1}{3}x-3\right)\)
d)\(\frac{x-6}{4}=\frac{4}{x-6}\)
e)\(\frac{2x-1}{3}=\frac{-27}{1-2x}\)
f)\(\left(x-1\right)^{x+2}=\left(x-1\right)^2\)
Tìm x , x biết :
a) / x - z / - / - \(\dfrac{3}{7}\) / = 10
b) / \(\left(x+\dfrac{1}{2}\right)\) / 2 x - \(\dfrac{3}{4}\) / / = 2x - \(\dfrac{3}{4}\)
c) / x / \(x^2\) + \(\dfrac{3}{4}\) // = 2x - \(\dfrac{3}{4}\)
tìm x,y,z biết
a.\(\left(\frac{1}{3}.x\right):\frac{2}{3}=4^3_8\)
b.\(1^2_3x-\frac{1}{4}=\frac{5}{6}\)
c.\(\left|x-\frac{2}{5}\right|+\frac{3}{4}=\frac{11}{4}\)
d.x:y:z=2:3:4 và x+y-2z=3
e.\(\frac{x}{4}=\frac{y}{3}=\frac{z}{9}vàx-3y+4z=62\)
C=x3+xy3-x3y+y3
tại x,y thỏa mãn:(x-1)4+(y+1)4=0
bái 1 :
a)x/4=y/3và x+y =14
b)x/19=y/21 và 2x-y = 34
c)x/5=y/3và x2 -y4 =4 (x,y>0)
bài 2 :
a)x/10 =y/6=z/24 và 5x +y-2z=28
b)x/3=y/4 ;y/5=z/7 và 2x+3y-z =186
c)x-1/2 =y-2/3=z-3/4 =x-2y+3z=14
