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16 tháng 7 2018

Xét hiệu \(2a^2+2b^2-4ab\)

  \(=2a^2-4ab+2b^2=2\left(a^2-2.a.b+b^2\right)\)

\(=2\left(a-b\right)^2\ge0\)

\(\Rightarrow2a^2+2b^2\ge4ab\).Dấu "=" xảy ra khi \(a=b\) 

GIẢI GIÚP EM VỚI ẠFill in the suitable words:  1- Mr. Johnson has learnt a lot (1a)____________Vietnam (1b) ____________he arrived here.2- His new book will probably be translated (2a) ____________a number (2b) ____________foreign languages.3- I was given a new pair of Jeans (3a) ____________the 15th birthday (3b) ____________my parents.4- There is a small bamboo forest (4a)____________he entrance (4b) ____________the village.5- She is a teacher (5a) ____________English, so she is good...
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GIẢI GIÚP EM VỚI Ạ

Fill in the suitable words:  

1- Mr. Johnson has learnt a lot (1a)____________Vietnam (1b) ____________he arrived here.

2- His new book will probably be translated (2a) ____________a number (2b) ____________foreign languages.

3- I was given a new pair of Jeans (3a) ____________the 15th birthday (3b) ____________my parents.

4- There is a small bamboo forest (4a)____________he entrance (4b) ____________the village.

5- She is a teacher (5a) ____________English, so she is good (5b) ____________it.

6- They took a bus to the countryside and walked for about 20 minutes (6a) _____________the picnic site (6b) ____________a river last Sunday.

7- When we finish class, we often talk (7a) ____________a while (7b) ____________going home.

8- He felt tired and hungry, so he sat (8a) ____________ (8b) ____________the tree and slept for some minutes.

9- She hopes she can talk (9a) ____________people (9b) ____________all over the world and they can understand her favorite English songs.

10- People go boating (10a) ____________the Thames which is beautiful (10b) ____________Summer.

1
17 tháng 1 2021

Fill in the suitable words:  

1- Mr. Johnson has learnt a lot (1a)______about______Vietnam (1b) _______when _____he arrived here.

2- His new book will probably be translated (2a) ____into________a number (2b) ________of____foreign languages.

3- I was given a new pair of Jeans (3a) ______on______the 15th birthday (3b) ____by________my parents.

4- There is a small bamboo forest (4a)______at______he entrance (4b) _______to_____the village.

5- She is a teacher (5a) ___of_________English, so she is good (5b) ________at____it.

6- They took a bus to the countryside and walked for about 20 minutes (6a) ____to_________the picnic site (6b) ______by______a river last Sunday.

7- When we finish class, we often talk (7a) ______for______a while (7b) _____when _______going home.

8- He felt tired and hungry, so he sat (8a) ______down______ (8b) ________under____the tree and slept for some minutes.

9- She hopes she can talk (9a) ______to______people (9b) _____in_______all over the world and they can understand her favorite English songs.

10- People go boating (10a) _______on_____the Thames which is beautiful (10b) ____in________Summer.

17 tháng 1 2021

Em cảm ơn ạ

20 tháng 5 2018

I. Em hãy nhìn vào những từ gợi ý dưới đây để viết câu hoàn chỉnh với "going to" ở thể khẳng định hoặc phủ định.

1a. My father/ go on/ diet. (khẳng định)

=> My father is going to go on a diet

1b. He/ drink/ so much beer. (phủ định)

=> He isn't going to drink so much beer

2a. My mother/ take/ more exercise. (khẳng định)

=> My mother is going to take more exercise

2b. She/ work/ so hard. (phủ định)

=> She isn't going to work so hard

3a. I/ have/ haircut. (khẳng định)

=> I am going to have my haircut

3b. I/ watch/ so much/ TV. (phủ định)

=> I am not going to watch so much TV

4a. My sister/ tidy/ bedroom. (khẳng định)

=> My sister is going to tidy the bedroom

4b. She/ talk/ phone for hours. (phủ định)

=> She isn't going to talk and phone for hours

5a. We/ be/ nicer/ each other. (khẳng định)

=> We are going to be nicer each other.

5b. We/ argue/ each other. (phủ định)

=> We are going to argue with each other

20 tháng 5 2018

1a. Bố tôi đang ăn kiêng

1b. Anh ấy sẽ không uống quá nhiều bia

2a. Mẹ tôi sẽ tập thể dục nhiều hơn

2b. Cô ấy sẽ làm việc chăm chỉ

3a. Tôi sẽ cắt tóc

3b. Tôi sẽ không xem nhiều TV

4a Em gái tôi sẽ dọn dẹp phòng ngủ của cô ấy

4b. Cô ấy sẽ không nói chuyện điện thoại hàng giờ

5a. Chúng ta sẽ đẹp hơn nhau

5b. Chúng tôi không đồng ý với nhau

15 tháng 9 2021

giúp mình với mình cần gấp

15 tháng 9 2021

a)A=(2x+y)2-(y-2x)2

\(A=(2x+y-y+2x)(2x+y+y-2x)\)

\(A=4x.2y=8xy\)

b)B=x2-y2+(x-y)2

\(B=x^2-y^2+x^2-2xy+y^2\)

\(B=2x^2-2xy\)

Lần sau bạn đăng vào môn Toán nhé!!!

10 tháng 5 2017

Điền giới từ thích hợp vào chỗ trống để hoàn thành các câu sau.

1. The store owners have been concerned ___1a_ABOUT__ the new mall _FOR__1b___ a few months.

2. Nga got __UP_2a___late this morning because her alarm clock didn’t go ___2b_OFF__.

3. She walked ___TO3a___ the kitchen and put her packages __ON_3b___the table.

4. He made a deep impression__AT_4a___ the members __IN_4b___ his English speaking club.

5. The driver in front stopped __TO_5a___ warning and we drove ___5b_TO__ the back of his car

Ex1 a : Viết dạng so sánh hơn và so sánh nhất ADJ          So sánh hơn        So sánh nhất1.Big           bigger              the  biggest   2. Hot……………………………………………3. Sweet…………………………………………..4. Few…………………………………………5. Little……………………………………………..6. Comfortable………………………………………7. Important……………………………………………..8. Expensive………………………………………..9. Good………………………………………………….10. Far…………………………………………………………………….11. Bad…………………………………………………………………....12. Thin…………………………………………………………………...13....
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Ex1 a : Viết dạng so sánh hơn và so sánh nhất 
ADJ          So sánh hơn        So sánh nhất
1.Big           bigger              the  biggest   
2. Hot……………………………………………
3. Sweet…………………………………………..
4. Few…………………………………………
5. Little……………………………………………..
6. Comfortable………………………………………
7. Important……………………………………………..
8. Expensive………………………………………..
9. Good………………………………………………….
10. Far…………………………………………………………………….
11. Bad…………………………………………………………………....
12. Thin…………………………………………………………………...
13. Busy………………………………………………………………….
14. Interesting …………………………………………………………..
15. Short………………………………………………………………….
16. High………………………………………………………………….
17. Much…………………………………………………………………
18. Funny………………………………………………………………..
19. Fast………………………………………………………………….
20. Boring ………………………………………………………

1
5 tháng 1 2023

2. Hot……hotter………………the hottest……
3. Sweet……sweeter    the sweetest…..
4. Few……fewer……the fewest.
5. Little…………………less……………the least…

6. Comfortable…more comfortable……the most comfortable…………
7. Important……more important…………the most important…..
8. Expensive……more expensive………the most expensive
9. Good……better…………the best…….
10. Far……farther………the farthest……………………………….
11. Bad……worse……the worst…………………………………....
12. Thin……thinner……the thinnest………………………………………...
13. Busy…busier…………the busiest………………………………….
14. Interesting …more interesting…………the most interesting……………..
15. Short……shorter…………the shortest……………………….
16. High……higher…………the highest………………….
17. Much……more………the most………………………………
18. Funny……funnier……the funniest………………………………..
19. Fast……faster…………the fastest……………………….
20. Boring ……more boring………the most boring…………

9 tháng 5 2017

Cho dạng đúng của động từ trong ngoặc.

1. When I (1a-meet) met him at the bookstore, he (1b-talk) was talking to his friends

2. My cousin (2a- not see) hasn’t been seen since he (2b- buy) bought a new color TV.

3. Peter (3a-wash) is washing his hands. He just (3b-repair) has just repaired his car.

4. Listen! I (4a-hear) hear someone (4b-knock) knocking at the front door.

5. Mr. Brown isn’t here now. Will You (5a-tell) tell him the news when he (5b-come) comes back, Nam?

Câu điều kiện 1 và 2 :1.People don't trust him because he tells lies.->If he.........................................2.She is so busy that she can't come to the party->If she ....................................3.I haven't got the money , so I'm not going on holiday.->If I..........................4.He often gets bad marks because he is lazy->If ................................................5.Do it now,or you will not finish it on time->If............................6.Hurry up,or we will...
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Câu điều kiện 1 và 2 :

1.People don't trust him because he tells lies.

->If he.........................................

2.She is so busy that she can't come to the party

->If she ....................................

3.I haven't got the money , so I'm not going on holiday.

->If I..........................

4.He often gets bad marks because he is lazy

->If ................................................

5.Do it now,or you will not finish it on time

->If............................

6.Hurry up,or we will ba late for the exam

->If.......................................

7.Be quiet ,or you will not understand the lesson

->If................................

8.I'm not a doctor , so I can't help you

->If..........................

9.They do not understand you because you do not often talk to them

->If..............................

10.I'm so busy , so I don't write to my friends regularly

->If I....................................

11.The office may be closed, so Mark won't be able to get in

->If the office...........................

12.You can't look the word up because you haven't got a dictionary

->If.........................

1
11 tháng 1 2023

1.People don't trust him because he tells lies.

->If he.........didn't tell lies, people would trust him................................

2.She is so busy that she can't come to the party

->If she ........weren't so busy, she could come to the party............................

3.I haven't got the money , so I'm not going on holiday.

->If I.....had got the money, I would be going on holiday.....................

4.He often gets bad marks because he is lazy

->If ........he weren't lazy, he wouldn't often get bad marks.......................................

5.Do it now,or you will not finish it on time

->If........you don't do it now, you won't finish it on time....................

6.Hurry up,or we will ba->be late for the exam

->If......we don't hurry up, we will be late for the exam.................................

7.Be quiet ,or you will not understand the lesson

->If........you aren't quiet, you won't understand the lesson........................

8.I'm not a doctor , so I can't help you

->If......I were a doctor, I could help you....................

9.They do not understand you because you do not often talk to them

->If.........you often talked to them, they would understand you....................

10.I'm so busy , so I don't write to my friends regularly

->If I....weren't so busy, I would write to my friends regularly................................

11.The office may be closed, so Mark won't be able to get in

->If the office.....isn't closed, Mark will be able to get in(Tham khảo c11)......................

12.You can't look the word up because you haven't got a dictionary

->If.........you had got a dictionary, you could look the world up................

-Câu điều kiện loại 1 diễn tả điều có thể xảy ra ở hiện tại hoặc tương lai

-Cấu trúc: If+S+V(hiện tại đơn), S+will/can/may+V(infinitive)

V.Rewite .1.He has watered the flowers for two hours .=> He started____________-2.He hasn’t swept his room for ages .=> He last ____________________3.The last _______________4.It’s ________________5.He didn’t……………………………………………6.      2B. She has never stayed up late before – It’s7.      2c. She last corrected the test at 4 o’clock- She hasn’t8.      2d. They have studied English since last week- They began 9.He does the test everyday .=> The test _____________________________10.They used that...
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V.Rewite .

1.He has watered the flowers for two hours .=> He started____________-

2.He hasn’t swept his room for ages .=> He last ____________________

3.The last _______________

4.It’s ________________

5.He didn’t……………………………………………

6.      2B. She has never stayed up late before – It’s

7.      2c. She last corrected the test at 4 o’clock- She hasn’t

8.      2d. They have studied English since last week- They began 

9.He does the test everyday .=> The test _____________________________

10.They used that computer yesterday. => That ___________________

11.He has just painted the walls. The walls__________________

12.She will sweep the street . => The street______________________

13.We are going to buy a new car .=> A new car______________________

14.He has to collect old clothes . => Old clothes_____________________

15.“ I do this test very well.” He said .+=> He said ___________________

16.“ You must clean your house .”  => He told me________________.

17.“Don’t close your book” .=> He told me____________________

18.“ Be careful please.” => She asked me ____________________

19.“ Are you now having dinner ,Ba?” => I asked ____________________

0
IV . Do the tasks below 2a . This is Jack's schedule for next week . Read and complete the sentences Monday Tuesday Wendnesday Tennis ( 5 p.m ) Dentist ( 10. 50 ) Dinner with ken ( 8 p. m ) 1 . He is going to play tennis on monday evening . 2...
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IV . Do the tasks below

2a . This is Jack's schedule for next week . Read and complete the sentences

Monday Tuesday Wendnesday
Tennis ( 5 p.m ) Dentist ( 10. 50 )

Dinner with ken ( 8 p. m )

1 . He is going to play tennis on monday evening .

2 ...................................................................................................................

3....................................................................................................................

2b . Make your shedule for next week . Then write about your schedule using present continuous or be going to

Monday Friday
Tuesday Saturday
Wednesday Sunday
Thursday

1...............................................................................................................................................................................................

2...............................................................................................................................................................................................

3.................................................................................................................................................................................................

4.................................................................................................................................................................................................

5.................................................................................................................................................................................................

6.................................................................................................................................................................................................

7.................................................................................................................................................................................................

1
5 tháng 7 2018

IV . Do the tasks below

2a . This is Jack's schedule for next week . Read and complete the sentences

Monday Tuesday Wendnesday
Tennis ( 5 p.m ) Dentist ( 10. 50 )

Dinner with ken ( 8 p. m )

1 . He is going to play tennis on monday evening .

2 . He is going to go to the dentist on Tuesday morning

3. He is going to have dinner with Ken on Wednesday evening

2b . Make your shedule for next week . Then write about your schedule using present continuous or be going to

Monday Friday
Tuesday Saturday
Wednesday Sunday
Thursday

1 I'm going to visit my grandparents on Monday morning

2 I'm going to watch TV at home on Tuesday evening

3 I'm going to sleep on Wednesday morning

4 I'm going to go to school on Thursday morning

5 I'm going to go to the doctor on Friday afternoon

6 I'm going to go to school on Saturday afternoon

7 I'm going to go to the museum on Sunday evening