`|x+2| + |x+3/5| + |x+1/2| =4x`
Do:
`|x+2| >= 0`
`|x+3/5| >= 0`
`|x+1/2| >= 0`
`=> |x+2| + |x+3/5| + |x+1/2| >= 0`
`=> 4x >=0`
mà `4 > 0 => x >= 0`
Khi đó: `|x+2| + |x+3/5| + |x+1/2| = x + 2 + x + 3/5 + x + 1/2 = 3x + 31/10`
`=> 3x + 31/10 = 4x`
`=> x = 31/10`
Tìm x biết:
1)3/4x-1/4=2(x-3)+1/4x
2)30%.x-x+5/6=1/3
3)(2.x-1).(3.x+9)=0
Cho 2 đa thức : P(x) = x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x ; Q(x) = 5x^4 - x^5 + 4x^2 - 2x^3 - 1/4
Tính : P(x) + Q(x) và P(x) - Q(x)
1,-15(x+2)+7(2x-3)
2,x^2+2x=0
3,(-2x)(-4x)+28=100
4,(2x-5)^2-49=0
5,/x-5/+/y-3/=1
6,3×(x-2)-6(x-5)=2(5-2x)
7, 5x ×(-x)^2+1=0
8,4x^3=4x
tìm X biết
a) 1/2 X + 2/3 ( X - 1 ) = 1/3
b) X mu 2 4X =0
c) 2/3 X : 1/5 = 3/2 : 1/4
D) 4X -( 3 + 5 ) = 14
Cho 2 đa thức : P(x) = x^5 - 2x^2 + 7x^4 - 9x^3 - 1/4x ; Q(x) = 5x^4 - x^5 + 4x^2 - 2x^3 - 1/4
Tính : P(x) + Q(x) và P(x) - Q(x)
Bài 1: Tìm x : A) 25%x+4x=35-0,75x
B) 3/4.(x-2) - 1/2.(6-2x)=1/6x + 5
C) -1/2.(3x+5) - 2/3.(9-6x)= 3/5.(x-10) - 3
D) (1/4x - 1,5) + (5/6x-3) - (5/8x-0,5)= -4,5
1) 2( 3x + 5) - 6=0
2) 5x + 3 ( 4+ 2x ) = 25
3) 3 ( 4x + 1) +2 (x - 1) =105
4) 30- [ 2( x - 3 ) - 2 ] = 14
5) 3 ( x - 8 ) (4x + 5 ) - 8 ( x - 8 ) = 0
6) 4x = 8
Tìm x biết
1)3/4x-1/4=2(x-3)+1/4x
2)30%.x-x+5/6=1/3
3)8/9x-2/3=1/3x+1 1/3
a) |x+1| + |x+2| = x
b) |x+1| + |x+2| + |x+3| = 2x
c) |x+1| + |x+2| + |x+3| + |x+4| = 3x
d) |x+1| + |x+2| + |x+3| + |x+4| + |x+5| = 4x
