Phân tích đa thức thành nhân tử:
a)x³-8x²+16x
b)x²+4y²+2x-4y-4xy-24
c)x⁴+x³-x²-2x-2

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)

Rewrite the following sentnces using the given words
1.The room is large.It can hold 80 people (enough)
=>The room______
2.Her hair is long and black.
=>She has_______
3.Alex intends to emigrate to the USA.
=>Alex is________
4.Going out it the rain at night is interesting.
=>It is___________
 

Use the correct form of verbs or tenses.

9. We oughtn’t (work)______ lazily and carelessly.   

10. She used (be)______ my next-door neighbor in Hue.   

11. Minh’s father (teach)______ him how to ride a bike when he was seven.