Lời giải:
\(-\left(4x-1\right)-\left(5x+1\right)-\left(1-3x\right)=4\left(2x-1\right)+6\\ \Leftrightarrow-4x+1-5x-1-1+3x=8x-4+6\\ \Leftrightarrow-6x-1=8x+2\\ \Leftrightarrow-6x-8x=2+1\\ \Leftrightarrow-14x=3\\ \Leftrightarrow x=-\dfrac{3}{14}\)
Vậy \(x=-\dfrac{3}{14}\)
1)6x-8=3x+1
2)12-10x=25-30x
3)3(2x+3)-2(4x-5)=10x+21
4)5(5x-3)-3(2x-4)11-5x
5)4(2-3x)-5(1-2x)=4-6x
6)8(4x-3)-3(2-3x)=13-40x
7)10x-5(1-4x)=5x-11
8)-3(3-4x)-5(4-3x)=12x-50
9)-2(20x-3)-3(4x-5)=9-2(2x-3)
10)-5(2-3x)+3(5-2x)=3x+3(3-5x)
1) 4x-(2x-5)=21
2) 14x+5=8x+10
3) 15+5x=3x+30
4) 2x-5=15-3x
5) 2(3x+5)+3(x+1)=6x+20
6) 4(x-3)+5(x-3)=18
tim x
a, ( 3-2x ) . ( 1/3 - 1/2 ) ^2 + 4 . (7-5x ) = 9-2x
b, 7 - 3x 1 - 3x
_______ = ______
4 + x x - 5
Bài 1: Tìm x biết :
a) (x+2)^2 - (3x-7)^2=0
b) (4x+1) -(5x-3)^2=0
c) 25(x-3)^2 - 49(2x+1)^2=0
d) 9(3x-2)^2=121(1-4x)^2
e) (x-5/4)^2=(5x+1/2)^2
Bài 1 : Tìm x
a) 2x + 1 phần 7 = 1 phần 3
b) 3(x - 1 phần 2) = 4 phần 9
c) ( x - 5)2 + 4 = 68
d) (|x|- 1 phần 2 ) (2x + 3 phần 2) = 0
e) 5x + 2 = 3x + 8
f) 26 - (5 - 2x) = 27
g) ( 4x - 8 ) - ( 2x - 6 ) = 4
h) (x + 3)3 ÷ 3 - 1 = - 10
Tim x E Z
â) x + 2 là U ( 3x -7 )
b) x -5 la B ( x + 1 )
c) 2x- 1 la U ( 5x 4 )
tim x
-2x(6x-2)+3x(4x-7)=8
(7x-2)(2x+3)-(3x-5)(4x+6)=2x2-5
+(-2x+3)-6x(3x-4)=-22x2+7x
Tìm x
1) -3-(-x) =5
2)-9-(x-3)=12
3)-10-(x-5)=-5
4)210-(10-x) =110
5)4x-(2x-5)=21
6)14x-5=8x+10
7)15+5x =3x+30
8)2x-5=15-3x
9)2(3x+5)+3(x+1)=x+220
10)4.(x-2+5(x-3)=18
Giúp mik vs
Mik cần gấp
1,Tìm x
a,13x+8=20+(-3)2.x
b,5x-7=(-2)3- (11+3x)
C,(12x -7)2=25
d,3.|2x+1|=|-3|.|-7|
e,(3x + 1)3= -125
F,\(\dfrac{x+6}{3}\) = \(\dfrac{4-x}{7}\)
g,\(\dfrac{x}{-26}\) = \(\dfrac{-5}{x}\)
h,\(\dfrac{12}{x+3}\) = \(\dfrac{x+3}{3}\)
i,13⋮ 2x - 1
j,2x + 5 ⋮ x+1
2,Tính giá trị biểu thức
a,A= 3x2 - 2x +1 với |x|=1
b,B=4x2-5y-3z với x=-5,y=4x= -27
c,C= -8x2y3 + 4xy2 - 3xy với x= -1,y=5
cho ví dụ:
N=3x2 - 2y +1 với x= -2,y=3x
x= -2 => y=3x=3.(-2)=-6
Thay x= -2,y= -6 vào biểu thức ta có:
N=3.(-2)2 -2.(-6)-1
= 3.4 - (-12)+1
= 12+12+1
=25
