(x-3)3-x3+9+6(x2+2x+1)
= x3-3x2+3x-1-x3+9+6x2+12x+6
=3x2+15x-14
(x-3)3-x3+9+6(x2+2x+1)
= x3-3x2+3x-1-x3+9+6x2+12x+6
=3x2+15x-14
(x-3)^3-(x-3)(x^2+3x+9)+6(x+1)^2
Tìm x biết
a, ( x - 2)2 - (x - 3)(x+3) = 6
b, 4( x - 3)2 --(2x - 1)(2x + 1)= 10
c, ( x - 4)2 - x (x -2(x + 2) = 6
d, 9( x + 1)^2 -(3x -2)(3x+ 2)= 10
Rút gọn : \(\left[\left(x^3-1-\frac{7-x^3}{3+x^3}\right).\frac{4}{x^5+3x^2}\right]:\left[\frac{3x^6-12}{x^9+6x^6+9x^3}.\frac{x}{3x^3+6}\right]\)
Tim x
a) \(\left(x+3\right)^3-x.\left(3x+1\right)^2+\left(2x+1\right).\left(4x^2-2x+1-3x^2\right)=54\)
b) \(\left(x-3\right)^3-\left(x-3\right).\left(x^2+3x+9\right)+6.\left(x+1\right)^2+3x^2=-33\)
1.
(x-3)(x^2+3x+9)+x(x-2)(x+2)=1
2.
(x+1)^3-(x-1)^3-6(x-1)^2= -10
phân tích đa thức sau thành nhân tử :
(3x+1)^2 - 4(x - 2 )^2
9(2x+3)^2 - 4(x+1)^2
8x^3 - 64
x^6 - y^6
(x+y)^3 - (x - y )^3
Bài 1 Rút gọn biểu thức
a, [(3x - 2)(x + 1) - (2x + 5)(x2 - 1)] : (x + 1)
b, (2x + 1)2 - 2(2x + 1)(3 - x) + (3 - x)2
c, (x - 1)2 - (x + 1) (x2 - x + 1) - (3x + 1)(1 - 3x)
d, (x2 + 1)(x - 3) - (x - 3)(x2 + 3x + 9)
e, (3x +2)2 + (3x - 2)2 - 2(3x + 2)(3x - 2) + x
Bài 2 Phân tích các đa thức sau thành nhân tử
1, 3(x + 4) - x2 - 4x
2, x2 - xy + x - y
3, 4x2 -25 + (2x + 7)(5 - 2x)
4, x2 + 4x - y2 + 4
5, x3 - x2 - x + 1
6, x3 + x2y - 4x - 4y
7, x3 - 3x2 + 1 - 3x
8, 2x2 + 3x - 5
9, x2 - 7xy + 10y2
10, x3 - 2x2 + x - xy2
x^2-6x+9=2x(x-3)
(x+3)^2+(x+2)(x-2)
(3x-1)^3-27(x+3)(x^2-3x+9)
x^4+2x^3+x
(3x+y)^2-4(2y-3x)^2
ai giai giup minh vs minh can ngay ngay mai