a: 2x+3-x=0
=>x+3=0
=>x=0-3
=>x=-3
d: \(7x-\left(x+1\right)=5\)
=>7x-x-1=5
=>6x=6
=>x=1
b: 5(x-3)+2x=7
=>5x-15+2x=7
=>7x=22
=>\(x=\dfrac{22}{7}\)
c: 4x-5=3x+2
=>4x-3x=5+2
=>x=7
e: -3x+2(3x+1)=3-x
=>-3x+6x+2=3-x
=>3x+2=3-x
=>4x=1
=>\(x=\dfrac{1}{4}\)
g: 15(x-2)-2(x+3)=8
=>15x-30-2x-6=8
=>13x-36=8
=>13x=36+8=44
=>\(x=\dfrac{44}{13}\)
TÌM X:
a) 5x-3=2x+1
b) 3.( x-5) - 5.(x+1)= 15
c) x-5/3 - x+2/5 = 1/2
d) 3x-7/2 = 5x-2/3
e) -2.(x-3) + 5.(x-1)= 3+x
f) x.(x-5)- x.(x-2)= 6-x
g) 1/3x-2=1/4x+4
Bài 1 tìm số hữu tỉ x biết
a) x*(-3/7)=4/21
b) (-4/7):x=2/5
c) x+1/12= -3/8
d) 2/15-x=-3/10
e) -x+4/5=1/2
f) 3/4(x+1)-1/2=3/7
g) -3/2-2x+3/4=-2
h) -x+4/5=1/2
Tìm x
A,2/3-|x|=1/5
B,|x+1,4|=2,6
C,|x+4/5|-1/7=0
D,(-1/2)^3× x=(-1/2)^5
E,x^2=4
F,(2x-3)^2=16
G,1/9×27^x=3^x
Tìm giá trị nhỏ nhất của biểu thức:
4/ Q = |x + 1/5| - x + 4/7
5/ D = |x| + |8 - x|
6/ L = |x - 2012| + |2011 - x|
7/ E = |x - 2006/2007| + |x - 1|
8/ F = |x - 1/4| + |x - 3/4|
9/ M = |x - 1| + |x - 2| + |x - 3|
10/ G = |x + 3| + |x - 2| + |x - 5|
11/ P = |x + 1/2| + |x + 1/3| + |x + 1/4|
12/ N = |x - 1| + |x - 2| + |x - 3| + |x - 4|
13/ H = |x - 2| + |x - 3| + |x - 4| + |x - 5|
14/ I = |x + 5| + |x + 2| + |x - 7| + |x - 8|
15/ K = |x - 1| + |x - 2| + |x - 3| + ... + |x - 1996|
Bài 1: Tìm x, biết
a) 3/7x - 2/3x =10/21
b) 7/35 : ( x- 1/3)=2/25
c) | 2x-4 |+1=5
d) 3.| 3 - 2x | - 1=2/5
e) 3.(x-1/2)-5(x+3/5)=-x+1/5
f) (2x-1).(x+2/3)=0
g) x+4/2008+x+3/2009=x+2/2010+x+1/2011
Bài 1 : Tìm x
a) 2/3 - 1/3 (x-3/2)-1/2(2x+1)=5
b) (x+1/2)(X-3/4)=0
c) 1/3 x + 3/5 (x+1)=0
d)x-8/2 > 0
e) x:(2/9 - 1/5 )=1/2
g) 1/3 + 1/2 : x = 1/5
Nhanh Nha
tìm x:
a) |4 - x| + 2x = 3
b) |x - 7| + 2x + 5 = 6
c) 3x - |2x + 1| = 2
d) |x + 2| - x = 2
e) |x - 3| = 21
f) |2x + 3| - |x - 3| = 0
g) |x + 1/8| + |x + 2/8| + |x + 5/8| = 4x
h) |x - 2| - |2x + 3| - x = -2
i) |2x - 3| - x = |2 - x|
k) 2. |x - 3| - |4x -1 = 0
tìm x
a, 11/13 -( 5/42 - x) = - (15/28 - 11/13)
b, x +1/3 = 2/5-(-1/3)
c, 2/3 x +5/7 =3/10
d, 3/7-x = 1/4 - (-3/5)
e, -21/13 x + 1/3 = -2/3
Tìm số tự nhiên x :
a) 2x + 3.(x+4) - 14 =8
b) x + 2.x + 3.x = 4.x + 16
c) 2.(x+1) + 3.(x + 5) = 0
d) ( x - 3 ).( x - 5 ) = 0
e) (2x - 40). (15 - 3.x) = 0
f) (3.x+6).(28-2.x) + 13 = 13
Tìm x biết : a) 2x+3/15 = 7/5. b) x-2/9 = 8/3. c) -8/x = -x/18 d) 2x+3/6 = x-2/5. e) x+1/22 = 6/x f) 2x-1/2 = 5/x g) 2x-1/21 = 3/2x+1 h) 10x+5/6 = 5/x+1
