Không

Có

x,y $\in$ tập rỗng

x=1; y=3

x=1; y=-3

x=-1; y=3

$\ x=10;\ y=\pm\frac{1}{2}$

$\ x=-10;\ y=\pm\frac{1}{2}$

$\ x=10;\ y=\frac{1}{2}$

$\ x=10;\ y=\pm12$

3x

$\frac{x-2}{x+4}$

6x

$3\left(x-1\right)^3$

$\left(x-1\right)^3$

$\left(1-x\right)^3$

x-4

$6x^3y^4z$

$6x^3y^4z^2$

$12x^3y^4z^5$

$6x^6y^4z$

$\left(x+4\right)^2$

$\left(x-4\right)^2$

$\left(x+2\right)^2$

$\left(x-3\right)^2$

A

B

C

D

$\left(x+y-1\right)^2$

$\left(x-y-1\right)^2$

$\left(x+y_{ }+1\right)^2$

$\left(x+y-2\right)^2$