\(5\left(x^2-3x+1\right)+x\left(1-5x\right)=x-2\)
\(=>5x^2-15x+5+x-5x^2=x-2\)
\(=>-14x+5=x-2\)
\(=>-15x=-7\)
\(=>x=\frac{7}{15}\)
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Bài 5. Tìm x , biết rằng: a) x(x + 5)(x – 5) – (x + 2)(x2 – 2x + 4) = 3
b) (x – 3)3 – (x – 3)(x2 + 3x + 9) + 9(x + 1)2 = 15
c) (x+5)(x2 –5x +25) – (x – 7) = x3
d) (x+2)(x2 – 2x + 4) – x(x2 + 2) = 4
tìm x, biết:
a) x2-2x+1=25
b) (5x+1)2-(5x-3)(5x+3)=30
c) (x-1)(x2+x+1)-x(x+2)(x-2)=5
d) (x-2)3-(x-3)(x2+3x+9)+6(x+1)2=15
tìm x biết:
a) x2-2x+1=25
b) (5x+1)2-(5x-3)(5x+3)=30
c) (x-1)(x2+x+1)-x(x+2)(x-2)=5
d) (x-2)3-(x-3)(x2+3x+9)+6(x+1)2=15
a) -(x-y)(x2+xy-1)
b) x2(x-1)-(x2+1)(x-y)
c) (3x-2)(2x-1)+(-5x-1)(3x+2)
d) (3x-5)(2x+11)-(2x3)(3x+7)
Bài 2: Tính giá trị biểu thức
C=x(x2-y)-x2(x+y)+y(x2-x) tại x=1/2, y=-1
a) 3x(x+1)-x(3x+2)
b) 2x(x2-5x+6)+(x-1)(x+3)
c) (x2-xy+y2)-(x2+2xy+y2)
d) (2/5xy+x-y)-(3x+4y)-2/5xy
e) 2xy(x2-4xy+4y2)
f) (x+y)(xy+5)
g) (x3-2x2-x+2):(x-1)
h) (2x2+3x-2):(2x-1)
Bài 2: Tìm x, biết:
a/ 12x(x – 5) – 3x(4x - 10) = 120
b/ 9x(x + 4) – 5x(3x + 2) = 112 - 2x(3x + 1)
c/ 3x(1 – x) - 5x(3x + 7) = 154 + 9x(5 – 2x)
Tìm x
a)(2x+1)2-4(x+2)2 =9
b)(3x-1)2 +2(x+3)2 +11(x+1)(1-x)=6
c)(x+1)3 - x2 (x+3)=2
d)(x-2)3 -x(x+1)(x-1)+6x2 =5
e)(x-3)(x2 +3x +9)-x(x+4)(x-4)=5
g)(x-2)3 -(x+5)(x2 -5x+25)+6x2 =11
Bài 2 : 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) (3x-2)(2x-1)-(6x2-3x)=0
b) x3-(x+1)(x2-x+1)=x
c) 56x4+7x=0
d) x2-5x-24=0
: Tìm x biết
a) (x + 1)3x – x( x -2)2 + x -1 = 0
b) ( x – 2)3 – x2(x -6) =4
c) ( x -1)( x2 + x + 1) – x( x+2)(x -2) =5
d) 3(x -1)2 – 3x( x -5) =1