\(x\left(2x+1\right)-2\left(x^2+3\right)\\ =2x^2+x-2x^2-6\\ =x-6\)
\(x\left(2x+1\right)-2\left(x^2+3\right)\)
\(=2x^2+x-2x^2-6\)
=x-6
\(x\left(2x+1\right)-2\left(x^2+3\right)\\ =2x^2+x-2x^2-6\\ =x-6\)
\(x\left(2x+1\right)-2\left(x^2+3\right)\)
\(=2x^2+x-2x^2-6\)
=x-6
tính (rút gọn )
2x(3x-1)-(2x+1)(x-3)
3(x^2-2x)-(4x+2)(x-1)
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)
Rút gọn
a)(x-3)2-x.(x-6)
b)(2x+1)2-(3+2x).(2x-3)-4.(x+2)
c)(2x2-3x+1):(x-1)
Rút gọn \(\left(\dfrac{1}{x-1}+2+\dfrac{2x^3+x^2-x}{1-x^3}\right):\dfrac{1-2x}{x^3+x-2}\)
rút gọn biểu thức: (x-2)^3 + (2x+1)^3 +2(x+2) (1-x) - 9x^3 +2x
bài 1 rút gọn biểu thức
a) (2x-5)^2-4x(x+3)
b) (x-2)^3 -6(x+4)(x-4)-(x-2)(x^2+2x+4)
c)(x-1)^2-2(x-1)(x+2)+(x+2)^2+5(2x-3)
bài 2 rút gọn biểu thức
a)(2-3x)^2-5x(x-4)+4(x-1)
b)(3-x)(x^2+3x+9)+(x-3)^3
c)(x-4)^2(x+4)-(x-4)(x+4)^2+3(x^2-16)
rút gọn
(x + 1) (x2 - x + 1) - (x -1) (x2 + x + 1)
(2x + 3) (2x-3) - (2x+1)2
(x+5).(x-4)-(x+2)^2+(2x+3)^3= (4x^2+1)+18(2x+3) rút gọn
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)