`2x-3/4=x+1/7`
`=> 2x-x=1/7 +3/4`
`=> x= 4/28 + 21/28`
`=> x= 25/28`
Vậy `x=25/28`
`(2x-3)/4 = (x+1)/7`
`=> 7(2x-3) = 4(x+1)`
`=> 14x- 21 = 4x+4`
`=> 14x-4x= 4+21`
`=> 10x=25`
`=>x=25/10`
`=>x= 5/2`
Bài tập: Rút gọn biểu thức
A=|x-2| + |3-x| +|2x-5|+|10-2x|
B=3|x-3|+2|4-x|+|x|
C=-6|x+1|-3|2x+1|+5|x-1|
D=-|x|+|3x-1|-|4x+1|+|x-9|
E=5|x-7|-2|2x-7|+3|x+5|-4|4-2x|
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
a,|7 - 2x| + 7 = 2x
b,| 1 - x | = 4x + 1
c, | x - 1/3 | + 4/5 = | ( 3,2) + 2/5 |
d,| x - 7 | + 2x + 5 = 6
e, 3x - | 2x - 1 | = 2
f(X)=7^5+x^4-2x^3+4;g(x)=x^4+6x^3-9x^2-2x-1
a) (x-1/5).(8/5+2x)=0
b) (x-4/7):(x+1/2)>0
c) (2x-3):(x+7/4)<0
Mong mn trả lời ạ
1) ( x-5 ) ( x+7 ) - 7x ( x+3 )
2) ( x+5 ) ( x+7 ) - ( x-4 ) ( x+3 )
3) ( 2x-3 ) ( x+4 ) + ( -x+1 ) ( x-2 )
Tìm x biết
a) (7^x-2+7^x-1+7)/57=(5^x+5^2x+1+5^2x+3)/131
b) (4x-3)^4=(4x-3)^2
Tìm x biết a) f(2x-3)=3x+7
b) f(2x-7/x-3)=x=3/x-4(x khác 3,4)
c) f(x-1/x)=x+1/x^2 -4 (x khác 0)
Bài 1: Tìm x biết
1) |5x - 3| = |7 - x|
2) 2 |3 x - 1| - 3x = 7
3) |2x + 3| + 4 = -2x
4) |x + 3/4| - 1/3 = 0
5) 1,6 - |x + 1,5| = 0
6) |x - 1,5| + |2,5 - x| = 0
1a) 2x+1/2=-5/3
B) -3x-3/4=6/5
C) 3/2x-2/5=1/2x-1/4
D) 1/2(x+2)-4(x-1/4)=1/2x
E) 4(1/2-x)-5(x-3/10)=7/4
Nhớ giải cuj thể nha
