2x(2x-1)^2-3x(x+3)(x-3)+4x(x-1)
2x(4x^2 - 4x + 1) - 3x(x^2 - 9) + 4x^2 - 4x
= 8x^3 - 8x^2 + 2x - 3x^3 + 27x + 4x^2 - 4x
= (8x^3 - 3x^3) + (-8x^2+ 4x^2) + (2x +27x - 4x)
= 5x^3 - 4x^2 + 25x
= x(5x^2 - 4x + 25)
Vậy........
Tính (rút gọn )
1, 2x(3x-1)-(2x+1)(x-3)
2, 3(x^2-2x)-(4x+2)(x-1)
3, 3x(x-5)-(x-2)^2 -(2x+3)(2x-3)
4, (2x-3)^2+(2x-1) (x+4)
tính (rút gọn )
2x(3x-1)-(2x+1)(x-3)
3(x^2-2x)-(4x+2)(x-1)
Rút gọn các biểu thức sau:
a. (x+5)2-4x(2x+3)2-(2x-1)(x+3)(x-3)
b. -2x(3x+2)(3x-2)+5(x+2)2-(x-1)(2x-1)(2x+1)
rút gọn 2x(2x-1)^2 - 3x(x+3)(x-3)-4x(x+1)^2
rút gọn biểu thức:(8x^3-4x^2):4x-(4x^2-5x):(2x)+(2x)^2
(3x^3-x^2y):x^2-(xy^2+x^2y):(xy)+2x(x-1)
Rút gọn
a, (x-2).(3x-1).(3x+1)-2x.(4x-3)^2
b, ( 5x-7)^2 - ( 4x -3).(2x+3)^2- (x-3).(3x^2-5)
c, (2-5x)^2-4x.(3x+1)^2-(x-3).(x+3)
Rút gọn
a, (x-2).(3x-1).(3x+1)-2x.(4x-3)^2
b, ( 5x-7)^2 - ( 4x -3).(2x+3)^2- (x-3).(3x^2-5)
c, (2-5x)^2-4x.(3x+1)^2-(x-3).(x+3)
Bài 1:Rút gọn biểu thức
1,3x(4x-3)-(2x-1)(sáu x +5)
2,2(3x-1)(2x+5)-(4x-1)(3x-2)
3,(3x-5)(2+11)-(2x+3)(3x+7)
4,(x-5)(2x+3)-2x(x-3)+x+7
Bài 1: Rút gọn
A = (3x - 1) ² + 2(3x -1) (2x+1) + (2x +1) ²
B = (2x +3) (4x ² - 6x + 9) + 8(1 - x) (1 +x +x ²)
