a) Biết 2 700 = 2².3³.5². Hãy viết 270 và 900 thành tích các thừa số nguyên tố.

b) Biết 3 600 = 2⁴ . 3² . 5². Hãy viết 180 và 600 thành tích các thừa số nguyên tố.

a) Biết 400 = 2⁴ . 5². Hãy viết 800 thành tích các thừa số nguyên tố.

b) Biết 320 = 2⁶ . 5. Hãy viết 3 200 thành tích các thừa số nguyên tố.

Rewrite the following sentences as directed (using the suggested words) so that the meanings stay the same. (1,0 point)

1. Phong likes Science most.

-> Phong’s favourite………………………………………………………

2. There are some chairs and a table in the kitchen.

-> We have ………………………………………………………………

3. The Blue Hotel is cheaper than the Green Hotel

-> The Green Hotel …………………………………………………

4. It is good if children go to bed early.

-> Children should……………………………………………………

Rearrange the order of the given words to make complete sentences.

(1,0 point)

1.The / are / and / clean / streets / wide.

    …………………………………………………………………………………………

2.bigger / An / is / bear. / elephant / a /

    …………………………………………………………………………………………

3.many / students / there / class? / How / your / are / in

    …………………………………………………………………………………………

4.the kitchen / We / cooking / in / are / dinner / at present.

    …………………………………………………………………………………………

Read the passage and then choose the correct answer to each question. (1,0 points)

     I always wish to have a motorhome in my life. My motorhome will be not need to be big, but it might have everything I need inside.

    There will be a small sofa and a lovely table in the head of the car. This will be the place for my friends when they visit me. It is like a living room. The biggest part of my motorhome will be my kitchen. It will be in the middle of the car. There will be an automatic dishwasher, amodern fridge, a small oven and an automatic washing machine in the kitchen. A small toilet will be in the kitchen too. The last part will be my bedroom, also my entertainment place. There will be a small bed, a wireless TV and a high – tech computer.

   Everything might be small in my motorhome. It would be fantastic if  I had my own motorhome. The best thing about having motorhome is that I can drive it myself  and travel around.

1. What kind of house does the writer wish to have?

A. a space houseboat              B.an auto house            C.a motorhome

2. What is NOT true about this house?

A.It will not be very big       

B.It has everything that the writer needs inside

C.The writer will have to do the laundry by hand

3. Why does the writer love this kind of house?

A.Because the house is big     

B.Because he can invite friends to his house

C.Because he can travel around with his house

4. What is the biggest part of the house?

A. The living room                  B. The kitchen              C. The bedroom

5. The word “ it” (in line 10) refers to “___________.”

A. a kitchen                B. a motorhome         C.a bedroom      

Your answers:

Read and choose the correct word marked A, B, or C to fill each blank in the following passage.(1,5 points)

My grandma is my best friend. She is my father’s mother. This year, she (1) .......................... 70 years old. She has a round face with long, white (2) .............................. She teaches me to wash the dishes and (3) ...................... dinner. She is (4) ........................... to other people. She helps them when she can. She is (5) ......................, too. She makes me laugh all the (6) .................... I love her so much.

Your answers:

Give the correct form of the verbs and words in the bracket. (1,0 points)                             

1. Nam usually ( go) ………. fishing with his friends, but  now  he and his friends (study) ………  in the class room.

2. Chidren must ( arrive ).....................class on time.

3. He ( wear) ...................a T-shirt and shorts today.

4. There ( be ) .................... a living room, three bedrooms, a kitchen in my new flat ?

Your answers:

Choose the best word and phrase (A,B,C, or D) to complete the sentences below. (2,0  points)

1. Mira is short with long brown………...

A. hair                              B. cheeks                   C.nose                      D. arms

2. My dad………….to work late.

A. never goes                   B. goes never             C. don’t go               D. never go

3. She is a good student. She …….… does her homework on time.

A. never                           B. rarely                     C. usually                  D. hardly

4. I don’t have …….…..homework to do at Tet.     

A. a little                          B. many                       C. a                           D. any

5. Listen! Someone ……. at the door.

A. are knocking               B. knocks                    C. is knocking          D. knock

6. Laura is very……. She is always entertaining us with jokes and stories.

A. confident                     B. funny                       C. caring                  D. active

7. Duong ................... piano lessons every Saturday.

A. plays                           B. has                           C. studies                 D.goes

8. The window is ..................... the big door.

A.behind                          B. next to                     C.under                    D.on

9. The USA has ................natural wonders.

A. many                           B.much                        C. a little                   D. any

10. - ....................do you play table tennis?

      - Once a week.

A. How much                 B. How long                 C. How far                D. How often

Choose the word (A, B, C, or D) whose underlined part is pronounced differently.(1,0 point) 

1. A. ear(s )                      B. eye(s)               C. lip(s)                    D. pencil(s)

2. A. s(ch)ool                   B. tea(ch)ing          C. (ch)ess                D. (ch)alk

3. A. st(u)dy                     B. l(u)nch             C. s(u)bject               D. comp(u)ter

4. A. cup(b)oard               B. (b)oarding        C. (b)iscuit                D. clim(b)ing

5. A. (s)ee                        B. (s)ugar             C. (s)and                   D. (s)uch

Your answers:

A=3 + 3² + 3³ + ... + 3²⁰²⁰ =3 (1 + 3) + 3³ (1 + 3) + ... + 3²⁰¹⁹ . (1 + 3)

=(1 + 3)(3 + 3³+...+3²⁰¹⁹)=4 . ( 3 + 3³+ ... + 3²⁰¹⁹) ⋮ 4