Chứng minh các biểu thức sau không âm. ( Luôn dương )

a) x^2-8x+20

b) x^2+11

c) 4x^2-12x+11

d) x^2+5y^2+2x+6y+34

g) (15-1)^2+3.(7x+3).(x+1)-(x^2-73)

f) x^2-2x+y^2+4y+6

(x+1).(x^2+2x+4)-x^2(x+3) với x=-1/10

I. Choose the correct completion in the brackets.

1. If we want to join the night party, we will have to work ...... and ....... to finish the work before 6 p.m.

A. more harder - more faster B. more hardly - more fastly

C. hardlier - fastlier D. harder - faster

2. It is very easy for children to get ........ on the Ipads, Iphones and other technological stuff.

A. familiar B. close C. hooked D. addicted

3. ................... should we spend this holiday, on a beautiful beach or at a resort?

A. what B. which C. where D. when

4. Like many women, she loves ....... parties and ........ gifts.

A. the - a B. a - the C. a - a D. ∅ - ∅

5. She works seven days ......... week.

A. a B. the C. an D. ∅

6. I don't work in Lublin any more. Last month I .............. a better job in Warsaw.

A. offered B. Was offered C. Were offered D. Did offered

7. We ............... Ho Chi Minh three times. Last summer we ............ there by plane.

A. flew/ gone B. have flown/ have gone

C. flew/ went D. have flown/ went

8. When I ............ the radio on yesterday, I ......... a song that was popular when I was in high school.

A. turned; heard B. have turned; have heard

C. have turned, heard D. turned; have heard

II. Find one mistake in each sentence and correct it.

1. He adores to go to the parties in weekends with his close friend.

=> ........................................

2. She can swim much more well than anyone else in my class.

=> ........................................

III. Correct forms of the verbs.

1. Bad driving (cause) ..................... many accidents.

2. I like (think) ................. carefully about things before (make) ............... a decision.

3. Mozart (wite) ...................... more than 600 pieces of music.

4. "How .......... you (learn) ............... to drive?" - " My father (teach) .......... me. "

5. We usually (go) .............. to the library three times a week, but last week we (go) ............... twice.

6. Alexander (introduce) ........................ the telephone in 1876.

7. Yesterday I (be) .............. busy, so I (not have) ....................... time to phone you.

8. Would you like (come) ..................... to dinner tomorrow?

9. Minh always (get) ............... grade A for Physics, but last semester he (get) ................ B. So Minh's teacher asked him (study) ................... harder this semester.

10. I (not meet) ....................... him since he (move) ........................... to Ha Noi.

11. She (be) .............. very ill now. She (not go) ..................... to school since Monday.

12. We (begin) ..................... to learn English three years ago. Now we (learn) ........................... for 3 years.

Mình cần trong chiều nay, mong mọi người giúp đỡ.

I. Choose the correct completion in the brackets.

1. If we want to join the night party, we will have to work ...... and ....... to finish the work before 6 p.m.

A. more harder - more faster B. more hardly - more fastly

C. hardlier - fastlier D. harder - faster

2. It is very easy for children to get ........ on the Ipads, Iphones and other technological stuff.

A. familiar B. close C. hooked D. addicted

3. ................... should we spend this holiday, on a beautiful beach or at a resort?

A. what B. which C. where D. when

4. Like many women, she loves ....... parties and ........ gifts.

A. the - a B. a - the C. a - a D. ∅ - ∅

5. She works seven days ......... week.

A. a B. the C. an D. ∅

6. I don't work in Lublin any more. Last month I .............. a better job in Warsaw.

A. offered B. Was offered C. Were offered D. Did offered

7. We ............... Ho Chi Minh three times. Last summer we ............ there by plane.

A. flew/ gone B. have flown/ have gone

C. flew/ went D. have flown/ went

8. When I ............ the radio on yesterday, I ......... a song that was popular when I was in high school.

A. turned; heard B. have turned; have heard

C. have turned, heard D. turned; have heard

II. Find one mistake in each sentence and correct it.

1. He adores to go to the parties in weekends with his close friend.

=> ........................................

2. She can swim much more well than anyone else in my class.

=> ........................................

III. Correct forms of the verbs.

1. Bad driving (cause) ..................... many accidents.

2. I like (think) ................. carefully about things before (make) ............... a decision.

3. Mozart (wite) ...................... more than 600 pieces of music.

4. "How .......... you (learn) ............... to drive?" - " My father (teach) .......... me. "

5. We usually (go) .............. to the library three times a week, but last week we (go) ............... twice.

6. Alexander (introduce) ........................ the telephone in 1876.

7. Yesterday I (be) .............. busy, so I (not have) ....................... time to phone you.

8. Would you like (come) ..................... to dinner tomorrow?

9. Minh always (get) ............... grade A for Physics, but last semester he (get) ................ B. So Minh's teacher asked him (study) ................... harder this semester.

10. I (not meet) ....................... him since he (move) ........................... to Ha Noi.

11. She (be) .............. very ill now. She (not go) ..................... to school since Monday.

12. We (begin) ..................... to learn English three years ago. Now we (learn) ........................... for 3 years.

Viết đoạn văn trong đó có sử dụng câu đặc biệt,câu rút gọn trạng ngữ.Nêu rõ

Tam giác ABC có góc B>góc C, gọi AH là đường vuông góc kẻ từ điểm A đến BC (H thuộc BC), M là điểm thuộc đoạn AH

a) So sánh: BH và CH

b) So sánh: MB và MC

Cho tam giác ABC (AB<AC) .Kẻ AH⊥BC,HI⊥AC (I∈AC).Trên tia đối của IH lấy E sao cho IE=IH

a)CM:AE⊥CE

b)CM:Góc BAH< Góc CAH

Cần gấp ạ,làm ơn giúp mình

1.Phát biểu cảm nghĩ về 2 khổ thơ cuối trong bài thơ “tiếng gà trưa” của Xuân Quỳnh

2.Cảm nghĩ về người bà trong đoạn trích:

“Tiếng gà trưa

Có tiếng bà vẫn mắng

.........

Đi qua nghe sột soạt”

Cần gấp ạ!!!

12 + 3 + 45