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28 tháng 12 2020

Gọi \(3n+2;5n+3=d\left(d\inℕ^∗\right)\)

\(3n+2⋮d\Rightarrow15n+10⋮d\)

\(5n+3⋮d\Rightarrow15n+9⋮d\)

Suy ra : \(15n+10-15n-9⋮d\)

\(1⋮d\)hay \(d\in\left\{1\right\}\)

Tương tự mấy phần kia :D 

5 tháng 1 2021

A. but           B. come          C. so           D.much

Chọn C.so

TEST 1 I. Decide the word which has a different sound in the part underlined. 1. A. hot A. thank 3. A. hit 4. A. and 5. A. desk B. bench C. when II. Choose the best answer. 1. My father always.. ......the news on the radio in the morning. A. listen to B. watches 2. My friends, Hoa and Ba,....... English on Monday and Friday. A. not have B. isn't have 3. You........stop when the traffic light turns red. A. go 4. My mother goes to the supermarket .foot. A. by 5. The meeting is very important, so...
Đọc tiếp
TEST 1 I. Decide the word which has a different sound in the part underlined. 1. A. hot A. thank 3. A. hit 4. A. and 5. A. desk B. bench C. when II. Choose the best answer. 1. My father always.. ......the news on the radio in the morning. A. listen to B. watches 2. My friends, Hoa and Ba,....... English on Monday and Friday. A. not have B. isn't have 3. You........stop when the traffic light turns red. A. go 4. My mother goes to the supermarket .foot. A. by 5. The meeting is very important, so you.... .be late! B. one C. box D. dog B. there B. fish C. night B. table 2. C. theirD. father D. this C. lamp D. family D. teacher C. listens to D. sees C. don't have D. doesn't have B. should С. must D. can В. on C. in D. at B. mustn't C. should D. shouldn't .. .take all necessary things along with you before you start the trip. A. must 6. You. A. should 7. It is often rainy in Hue,.. A. but 8. Which city is... .Ha Noi or Ho Chi Minh City? A. large 9. We should help our mothers... .the table after the meal. B. shouldn't mustn't .remember to bring an umbrella С. D. can В.or C. so D. must B. larger C. largest D. the largest C. clear A. make 10. I will......my lucky money in my piggy bank. A. keep III. Complete each sentence with the comparative form of the adjective in brackets. 1. It's (hot).............here than it is in my hometown. 2. Michael is a (successful) 3. Swimming is (good).. 4. Your spelling is (bad).. 5. These books are ( interesting). IV. Read the passage and circle A, B or C to complete the sentences. Every country has its own tradition when New Year comes. In Japan, at midnight on December 31 jall temples in the country ring their bells 108 times. They believe that the ringing bells can remove their bad actions from the previous year. In Thailand, the New Year is in April. It's the hottest time of the year. People often throw water over other people. They believe that this activity will bring a lot of rain and wash away the bad things. In Viet Nam, people clean and decorate their houses before Tet. They would like their houses to look more beautiful. The first footer is very important. They believe that the first footer on the first New Year Day decides the family's luck for the whole year. 1. People in Japan believe that 108 times of ringing bell can remove their.. .from the previous year A. good actions B. rude actions 2. April is.....time of the year in Thailand. A. hot B. to make D. to clearing B. spend C. borrow D. give ...tennis player than his brother for your health than golf. ..... than mine. ........ than these ones. C. bad actions B. the hottest C. hottest ..and wash away the 3. People in Thailand believe that throwing water over other people will bad things. A. not bring a lot ofrain 4. People in Viet Nam usually clean and decorate their houses before Tet. They to look more beautiful. C. bring a lot of rain their houses B. brings a lot of rain C. likes A. dislike 5. The first people who comes to someone's house on the first day at Tet is called. B. would like 3 C. the first footer B. the first A. first comer V. Rewrite the second sentence so that it has the same meaning. 1. My class has thirty five students. There ... ......******** 2. In the garden, there are many flowers and fruits. The garden........... 3. My father often rides motorbike to work. My father goes............ 4. The hotel is behind the hospital The hospital. TEST : i: Put the verbs in brackets into the correct tense or form. 1. Yesterday, I (go). 2. This house (stand) 3. I(see) 4. I (not go) 5. She (get) * What to the restaurant with a client. for centuries. that film several times because I like to school last Sunday. married last year? last night? you (do) my homework. 6. -1 (do) 7. We (do) 8. Yesterday, I (get) exercise at the moment. breakfast at 6.30. up at 6 and (have) to school yesterday? he (walk) No, he 10. In the future, robots (be able to) 11. People ( speak) 12. They ( not do) 13. He (not smoke) 14. My wife and I (travel) 15. I (have) 16. She (have) 17. This is my house. - How long I (live)_ 18. There (be) 19. Be careful! The baby (sleep) 20. Hoa could ( play). understand what we say. English and French in Canada their homework last night. for two weeks. He is trying to give it up. to Mexico by air last summer a little trouble with my car last week coffee for breakfast every morning. you (live) here since 1970. 20 rooms in my future house. here? - piano, but now she can't. II. Choose the correct answers 1. Do you know Janelyn? Yes, of course, I (met/ meet/ is meeting) her every day! 2. I ( am / was / were ) very happy on my last vacation. 3. Where is Tom? Ah! he (is playing/ plays/played) football with his friends in the garden 5. He ( doesn't/ won't / didn't) come here tomorrow. 6. (When / where / What time ) did you see her ?- Yesterday morning. 7. We ( are visiting / will visit / visit / visited) Ha Long Bay last summer vacation. 8. Lan sometimes (goes / go / went/ is going ) to the zoo. 9. When they (was / will be / were / are ) children, they often played with each other. 10. Yesterday, I ( am buying / going to buy / buy / bought) many gifts for him on the trip to Ha Noi. III: Arrange these words 1. often/ I/ the/ museum/ Saturday/ visit/ on 2. cooking/ sister/ in/ my/ is/ dinner/ kitchen/the 3. do not/ Jane/ usually/ breakfast/ morning/ in the/ have. 4. tired/ 1/ when/ cycle/ to/ school/ am/ always/I
3

#Tách ra bạn ơi , đáp án lẫn lộn quá

TEST 1

II. Choose the best answer.

1. My father always.. ......the news on the radio in the morning

. A. listen to B. watches

2. My friends, Hoa and Ba,....... English on Monday and Friday.

A. not have B. isn't have  C. Don't have

3. You......must..stop when the traffic light turns red.

A. go

4. My mother goes to the supermarket on foot.

 5. The meeting is very important, so you.... .be late!

C. should D. shouldn't  

8. Which city is..larger. .Ha Noi or Ho Chi Minh City?

A. large B. larger C. largest D. the largest 

10. I will......my lucky money in my piggy bank.

A. keep

r V. Rewrite the second sentence so that it has the same meaning.

1. My class has thirty five students.

There are thirty five students in my class

2. In the garden, there are many flowers and fruits.

The garden has many flowers and fruits

3. My father often rides motorbike to work.

My father goes by motorbike

 4. The hotel is behind the hospital

The hospital is in front of the hotel

II. Choose the correct answers

1. Do you know Janelyn? Yes, of course, I (met/ meet/ is meeting) her every day!

2. I ( am / was / were ) very happy on my last vacation.

3. Where is Tom? Ah! he (is playing/ plays/played) football with his friends in the garden

5. He ( doesn't/ won't / didn't) come here tomorrow.

6. (When / where / What time ) did you see her ?- Yesterday morning.

7. We ( are visiting / will visit / visit / visited) Ha Long Bay last summer vacation.

8. Lan sometimes (goes / go / went/ is going ) to the zoo.

9. When they (was / will be / were / are ) children, they often played with each other.

10. Yesterday, I ( am buying / going to buy / buy / bought) many gifts for him on the trip to Ha Noi.

29 tháng 12 2020

do trái đất tự quay quanh trục theo hướng từ tây sang đông nên mọi nới trên trái đất đều có hiện tượng ngày và đêm

4 tháng 1 2021

Nguyên nhân của hiện tượng ngày đêm kế tiếp nhau ở khắp mọi nơi trên Trái Đất là do

A. Trái Đất hình cầu.

B. Trái Đất hình cầu và quay quanh Mặt Trời.

C. Trái Đất hình cầu và tự quay quanh trục.

D. Trái Đất quay quanh Mặt Trời.