has got

19.c

20.a

21.c

23. a

24.a

a, 8x³- 1000 = (2x)³ - 10³ = (2x -10). (4x² + 20x +100)

b,\(0,001+64x^3=\left(\dfrac{1}{10}\right)^3+\left(4x\right)^3=\left(\dfrac{1}{10}+4x\right).\left(\dfrac{1}{100}-\dfrac{2}{5}x+16x^2\right)\)

c, \(\dfrac{1}{125}y^3+x^3=\left(\dfrac{1}{5}y\right)^3+x^3=\left(\dfrac{1}{5}y+x\right).\left(\dfrac{1}{25}y^2-\dfrac{1}{5}yx+x^2\right)\)

\(d,27x^3-\dfrac{1}{8}y^3=\left(3x\right)^3-\left(\dfrac{1}{2}y\right)^3=\left(3x-\dfrac{1}{2}y\right).\left(9x^2+\dfrac{3}{2}xy+\dfrac{1}{4}y^2\right)\)

What are naughty boys!

từ tượng thanh nha

từ héo nha

7 phân tử A -mo- ni- ac

16. goes

17. Do (you) listen

18. does (she) go

19. are learning

20. is riding

1. When is your birthday?

2. Where do you live?

3. What about going to the cinema?

4. Let's go camping