[x-3] = 2x + 4
=> x - 3= -(2x +4) hoac x-3 = 2x +4
th1 : x-3 = -2x -4
x +2x = -4 +3
3x = -1
x=\(\frac{-1}{3}\)
th2: x-3 =2x +4
x-2x = 4+3
-x = 7
x = -7
vay x \(\varepsilon\){-\(\frac{1}{3}\); -7}
[x-3] = 2x + 4
=> x - 3= -(2x +4) hoac x-3 = 2x +4
th1 : x-3 = -2x -4
x +2x = -4 +3
3x = -1
x=\(\frac{-1}{3}\)
th2: x-3 =2x +4
x-2x = 4+3
-x = 7
x = -7
vay x \(\varepsilon\){-\(\frac{1}{3}\); -7}
tìm x biết
3) |x| = 3+2x
4) | 3-2x| =4/3
Tìm x biết I ( x + 1/2 ) I 2x - 3/4 II = 2x - 3/4
Bài 13: Tìm x biết: a) (x-2)(x-3)-D0. b) (x-3)(x-4)-0. c) (x-7)(6-x)=0. d) (x-3)(x-13)=0. The Bài 14: Tìm x biết: a) (12-x)(2-x)=0. b) (x-33)(11-x)=0. c) (21-x)(12-x)=0. d) (50-x)(x-150) =0. Bài 15: Tìm x biết: a) 2x +x = 45. b) 2x +7x = 918. c) 2x+3x 60+5. d) 11x+22x 33.2.
Tìm x biết 1/2x + 2/3( 2x - 4 ) - 4/5 + x - 18 = 0
Tìm x,y biết
(2x + 1) x (2x + 2) x (2x + 3) x (2x + 4) -15y =1679
Tìm x biết:
a)(2x-3)-(x-5)=(x+7)-(x+2)
b)(7x-5)-(6x+4)+(2x+3)-(2x+1)
c)(9x-3)-(8x+5)=(3x+2)
d)(x+7)-(2x+3)=(3x+5)-(2x+4)
tìm x,y biết :
a, 3 - 2x = 3.(5-x) + 4
b, 4 - ( 7x + 2017 ) = 6 . ( 5-x) - 2017
c, 15 - x (x+1) = 4 - x^2 + 2x
d, -4.(x-5) + 2016 = 3.(8-x)-(2x - 2016)
Tìm x, biết
a)-2x+ -3/4 = x-3/5
b)|1/2x-1/3|-3/2=1/4
Tìm số nguyên x biết
m) (x-4).(3-x)=0
n) 2.(x-5)+4=2
h)2,5x-8=2x+3