9. __________ cousins are in Australia now. *

1 điểm

A. That

B. These

C. This

D. A

10. __________ Jessica got a sister or a brother at this school? She has a brother in class 9B *

1 điểm

A. Have

B. Has

c.'ve

d.'s

1. Your house is smaller than my house

2. The red car is more expensive than the black car

3. That film is more boring than this one

4. Your kitchen is bigger than mine

5. I can cook better than my mother

5. My house is more modern than her house

\(a.\\ x^2-9=\left(x-3\right)\left(x+3\right)\\ b.\\ 4x^2-25=\left(2x\right)^2-5^2\\ =\left(2x-5\right)\left(2x+5\right)\\ c.\\ x^6-y^6=\left(x^2\right)^3-\left(y^2\right)^3\\ =\left(x^2-y^2\right)\left(x^4+x^2y^2+y^4\right)\\ =\left(x-y\right)\left(x+y\right)\left(x^2+y^2+xy\right)\left(x^2+y^2-xy\right)\\ \)

\(d.\\ 9x^2+6xy+y^2=\left(3x\right)^2+2\cdot3\cdot x\cdot y+y^2\\ =\left(3x+y\right)^2\\ e.\\ 6x-9-x^2=-\left(x^2-6x+9\right)\\=-\left(x-3\right)^2\\ f.\\ x^2+4y^2+4xy=x^2+4xy+\left(2y\right)^2=\left(x+2y\right)^2\)

II. Make questions with the underlined part in each sentence

1.      I’m going to buy a new bicycle next week.

What are you going to buy next week?

2.      I ride my bike to school everyday.

How often do you ride your bike to school?

3.      She had to go to school by bus yesterday because her bike had a flat tire.

Why did she have to go to school by bus yesterday?

4.      Nam got his new bike two weeks ago.

When did Nam get his new bike?

5.      I felt better after I took a nap.

How did you feel after taking a nap?

Ta có: Ax//Bt

=> Góc xAB=góc ABt=\(35^o\)( 2 góc so le trong)

Mà Bt là tia phân giác của góc ABC

=>  góc tBC= \(35^o\)

=> góc tBC+  góc yCB \(=35^o+145^o=180^o\)

Mà 2 góc này ở vị trí trong cùng phía

nên Ax//Cy (đpcm)

Nhận định nào sau đây không đúng?

Vỏ electron mang điện tích âm và chuyển động xung quanh hạt nhân.

Tất cả các hạt nhân nguyên tử đều chứa proton và notron.

Nguyên tử là hạt vô cùng nhỏ và trung hòa về điện.

Khối lượng nguyên tử tập trung ở hạt nhân.

31. They don't believe _______ living together before marriage.

     A. from                         B. for                             C. to                              D. in

32. It's important to protect your skin _______ the harmful effects of the sun.

     A. from                         B. on                             C. to                              D. at

33. He's addicted _______ coffee and cannot do anything in the morning until he's had some.

     A. from                         B. on                             C. to                              D. at

34. He could see that the road ahead _______ him was clear.

     A. from                         B. on                             C. of                              D. for

35. Maria was so involved _______ her work that she didn’t hear me come in.

     A. from                         B. at                              C. to                              D. in

36. The slow cooker is very useful _______ people who go out all day.

     A. about                        B. for                             C. in                              D. at

37. Were you aware _______ the risks at the time?

     A. from                         B. of                              C. to                              D. in

38. I've always been afraid _______ flying.

     A. of                              B. on                             C. to                              D. at

39. A diet deficient _______ vitamin D may cause the disease rickets.

     A. for                            B. on                             C. to                              D. in

40. Breathing in other people's cigarette smoke is bad _______ you.

     A. for                            B. on                             C. to                              D. at

I like this __poem_________. It makes me happy. (poetry)

Real __friendship____________ is more valuable than money. (friend)

What a pity! My friend cannot stay with me longer. --> I wish…My friend could stay with me ……………………longer

People speak French in many countries in Africa. --> French is …spoken……in Africa. *

She began to play tennis 2 years ago. --> She has …played tennis for…………2 years. 

I turned off the TV set and went to bed because the film was very boring. --> The film ...was so boring that I turned off the TV and...went to bed. (so ..that)

Is there a tv in the bedroom ?

--> I asked her if there was a TV in the bedroom___

Ta có: tổng số hạt là 115

<=> \(2p+n=115\left(1\right)\)

Số hạt mang điện nhiều hơn  số hạt không mang điện là 25

<=> \(2p-n=25\left(2\right)\)

Từ (1) và (2) Giải hệ ta được:

\(p=35\\ n=45\\ =>A=45+35=80\)