$$20x^3yz$$  

$$-5x^3yz$$  

$$5x^3yz$$  

$$-20x^3yz$$  

$$-8ab^3c^4$$  

$$-2ab^3c^4$$  

$$8ab^3c^4$$  

$$2ab^2c^4$$  

$$-72m^4n^6$$  

$$-72m^2n^3$$  

$$72m^2n^3$$  

$$72m^4n^6$$  

$$-2xy+y$$  

$$4xy-5y$$  

$$2xy+5y$$  

$$-4xy+5y$$  

$$4ab^2+2xy-z$$  

$$4ab^2+2xy+z$$  

$$4ab^2-2xy+z$$  

$$4ab^2-2xy-z$$  

$$15x^2y-3xy^3$$  

$$15x^3y-3xy^2$$  

$$15x^3y-3x^3y^2$$  

$$15x^3y^3-3x^3y^2$$  

8a - 2b + 6c

18a + 2b + 6c

18a + 2b - 10c

8a + 2b + 6c

x² - 4x - 2

x² + 4x + 2

x² - 4x + 2

x² + 4x - 2

x² - 3x

x² + 3x

-x² - 3x

-x² + 3x

$$5y+7$$  

$$7x^{-1}$$  

$$8x^2+9x-4$$  

$$-\frac{3}{4}y$$  

$$-7$$  

$$-2$$  

$$-\frac{7}{2}$$  

$$7$$  

$$\left(5xy^3\right)^2$$

$$\left(5^2xy^2\right)^2$$

$$\left(5^2xy\right)^2$$

$$\left(5xy^2\right)^2$$

$$-12x^2-9x-6$$  

$$-32x^4-20x^3+24x^2$$  

$$-32x^4-9x^3+10x^2$$  

$$4x^2+x+10$$  

$$\frac{1}{4}a\ \ กับ\ \ \frac{4}{a}$$

$$3m^0n\ \ กับ\ \ 5mn$$

$$6pq\ \ กับ\ \ \frac{pq^2}{q^2}$$

$$\sqrt{3}x^3y^2\ \ กับ\ \ \sqrt{5}x^3y^2$$