\(\Leftrightarrow x^3-1-x^3-3x^2-3x-1=3x^2-8\)
=>-3x^2-3x-2-3x^2+8=0
=>-6x^2-3x+6=0
=>\(x\in\left\{\dfrac{-1+\sqrt{17}}{4};\dfrac{-1-\sqrt{17}}{4}\right\}\)
Bài 1: Rút gọn và tính giá trị biểu thức
D= (x-5)(-3x+1)-3(x-2)(2x-1) tại x=\(\dfrac{1}{3}\)
E= (x-7)(x+8)-(x-5)(x-2) tại x=\(\dfrac{-1}{5}\)
F=-3(x-8)(2x+1)-(x+5)(-3x+2)-4x(x-6) tại x=-3
Bài 2 : Rút gọn
A = -7x(x-5)-(x-1)(x2-x-2)+x2(x-3)-5x(x-8)
B = (6x-5)(x+8)-(3x-1)(2x+3)-9(4x-3)
C =(8x-1)(x+7)-(x-2)(8x+5)-11(6x+1)
Bài 3 : giá trị ko phụ thuộc vào biến x
-3(x-4)(x-2)+x(3x-18)-25
(x-3)(x+7)-(2x-1)(x+2)+x(x-1)
Tìm x:
1. 3x (2x + 3) - (2x + 5).(3x - 2) = 8
2. 4x (x -1) - 3(x2 - 5) -x2 = (x - 3) - (x + 4)
3. 2 (3x -1) (2x +5) - 6 (2x - 1) (x + 2) = -6
4. 3 ( 2x - 1) (3x - 1) - (2x - 3) (9x - 1) - 3 = -3
5. (3x - 1) (2x + 7) - ( x + 1) (6x - 5) = (x + 2) - (x - 5)
6. 3xy (x + y) - (x + y) (x2 + y2 + 2xy) + y3 = 27
7. 3x (8x - 4) - 6x (4x - 3) = 30
8. 3x (5 - 2x) + 2x (3x - 5) = 20
HELP ME T^T
Tìm x biết : a.3x.(x+1)-2x.(x+20=-1-x
b.(3x-1).(2x+7)-(x+1).(6x-5)=16
c.(10x+9).x-(5x-1).(2x+3)=8
Bài 1 : Tìm x, biết
a) 3x(x2 - 2) + x2(1-2x) - x2 = -12
b) 3x(2x +3) - (2x +5)(3x -2) = 8
c)3(3x -1)(2x+5) - 6(2x -1)(x+2) = -6
d) 3(2x -1)(3x - 1)- (2x -3)(9x -1) - 3 = -3
e) 4x(x-1)- 3(x2 -5)- x2 = (x-3)(x+4)
f) (3x-1)(2x+7)-(x+1)(6x-5)= (x+2)-(x-5)
😭😭😭🌚🌚🌚😞😞😞
1. x+2/x-2-1/x=2/x(x-2)
2. 5x +2(x-2)=17
3. x+3x+2/2=1-5x/6
4. x^2 . -16 =3(x-4)
5. x/x-1-x+1/2x+3=1+4x/(x-1)(2x+3)
6. 3x+1=7x-11
7. (x-1)(3x+2)=0
8. 3x-2=-14
9. (4x-2)(3x+5)=0
10. 2x+1/3-7x+5/15=x-2/5
Tìm x , biết :
a) ( 3x -1 ) (2x+7) - ( x +1) (6x-5 ) = 16
b) ( 10x +9 )x - ( 5x -1 ) (2x+3 )= 8
c) ( 3x - 5 ) ( 7- 5x ) + ( 5x +2 )( 3x-2 ) -2 = 0
d) x(x + 1) ( x+6 ) - x3 = 5x
Tìm x:
a, 3.(2x-1).(3x-1)-(2x-3).(9x-1)-3=-3
b, (3x-1).(2x+7)-(x+1).(6x-5)=(x+2)-(x-5)
c, (6x-2)2+(5x-2)2-4.(3x-1).(5x-2)=0
d, (x+3)2-(x-4).(x+8)=1
e, 3.(x+2)2+(2x-1)2-7.(x+3).(x-3)=36
a, A = (5x-2) × (x+1) - ( x-3) × (5x+1) - 17( x+3)
b, B = (6x-5) × ( x+8) - (3x-1) × (2x+3) - 9(4x-3)
c, C = x(x^3 + x^2 - 3x -2 ) - ( x^2 -2 ) × ( x^2+x -1 )
Bài 1.Tìm x biết
a,(x+8)(x+6)=104+x^2
b,(x+1)(x+2)-(x-3)(x+4)=6
c,4x(x-5)-(x-1)(4x-3)=5
d,(3x-4)(x-2)=3x(x-9)-3
e,(x-5)(x-4)-(+1)(x-2)=7
f,5x(x-3)=(x-2)(5x-1)-5
