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Nguyễn Quỳnh Như
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Tiểu Thư họ Nguyễn
10 tháng 8 2017 lúc 17:44

1. (A) t(e)chnique (B) el(e)ctric (C) r(e)source (D) d(e)ntist

2. (A) n(i)ce (B) k(i)nd (C) m(i)ll (D) f(i)ne

3. (A) requir(ed) (B) visit(ed) (C) sav(ed) (D) imporv(ed)

4. (A) (wh)ole (B) (wh)ich (C) (wh)ile (D) (wh)ere

Huy Nguyen
15 tháng 1 2021 lúc 18:37

1. (A) t(e)chnique (B) el(e)ctric (C) r(e)source (D) d(e)ntist

2. (A) n(i)ce (B) k(i)nd (C) m(i)ll (D) f(i)ne

3. (A) requir(ed) (B) visit(ed) (C) sav(ed) (D) imporv(ed)

4. (A) (wh)ole (B) (wh)ich (C) (wh)ile (D) (wh)ere

Phương Anh Đào
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missing you =
26 tháng 11 2021 lúc 18:55

\(A=x^2-4xy+4y^2+2x-4y+1+y^2+2y+1+2008\)

\(A=\left(x-2y\right)^2+2\left(x-2y\right)+1+\left(y+1\right)^2+2008\)

\(A=\left(x-2y+1\right)^2+\left(y+1\right)^2+2008\ge2008\)

\(\Rightarrow A_{min}=2008\Leftrightarrow\left\{{}\begin{matrix}x-2y+1=0\\y+1=0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=-3\\y=-1\end{matrix}\right.\)

Nguyễn Ngọc Trâm Anh
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Lê Phương Mai
25 tháng 1 2022 lúc 10:41

I.

1, C

2, B

3, C

4, D

5, C

6, C

7, C

8, B

 

Nguyễn Ngọc Khánh Huyền
25 tháng 1 2022 lúc 10:41

bn tách ra đi, chứ nhìn qua thấy nản lắm/:

Nguyễn Minh Anh
25 tháng 1 2022 lúc 10:44

II. Choose the best answer to complete each sentence.

1.We’ll meet……………..the movies theater.           

A. in front of                  B. next to                       C. on                    D. opposite
2.Did you …….. to school yesterday.
A. go                                B. went                            C. going                D. goes.
3. It’s not far…………..here, so I often walk.
A. to                                 B. with                             C. from                 D. over
4.………………….to meet you Hoa.
A. Please                          B. Pleased                       

C. I’m please                  D. None is correct
5.Hoa is sad, because she knows …………………here.
A. someone                      B. anyone                         C. no one                   D. everyone
6.Her new school is……………than her old one.
A. bigger                          B. large                            C. beautiful                D. more
7.My brother is ………………grade 7.
A. at                                 B. in                                 C. on                          D. of
8.Everyday he………….the bus to work.
A. gives                           B. comes                          C. catches                  D. goes
9.Lan is staying…………..her aunt’s house in Hanoi now.
A. in                                 B. on                               C. with                       D. at
10.It often ……………me 15 minutes to go to school by bike.
A. takes                     B. gets                             C. gives                       D. has

11. They suggested that he…………. by bike or public transport.

A. should travel         B. might travel             C. travels                     D. traveledp

12. The light…………… so we couldn’t see any thing in the dark.

A. went                     B. went off                   C. went by                   D. went out

13. You should get a ………..to check if there is any crack in the pipe.

A. electrician             B.plumber                 C. carpenter                 D. goldsmith

14.Is it true……………. the law says there is no smoking in restaurant in this city?

A.that what                B. what                        C. if                             D. that

15. Lan is a…………………typist. She often makes many spelling mistakes.

A. careful                  B. care                      C. careless                   D.carelessly

16. Where …………. you last Sunday ?

     a. is                          b. was                    c. are                               d. were

17. Last week, Mr. Tan…………….to Ho Chi Minh City for a trip.

     a. go                         b. went                   c. going                            d. goes

18. What is your …………, Lan? – I’m 45 kilos.

     a. weight                  b. height                c. age                               d. name

19. ……………is this book? – It’s 4,000 dong.

     a. How much           b. How old            c. How many                   d. How tall

20. Yesterday, I …………….to school because I was sick.

     a. goes                     b. go                      c. went                             d. didn’t go

21. Hoa ………………her teeth three times every day.

     a. brushes                 b. brushing             c. brush                            d. brushed

22. Did you buy any souvenirs in Nha Trang ? + Yes, I ……………

     a. do                         b. am                     c. does                             d. did

23. I live ……………Quang Tri town with my grandmother.

     a. on                         b. at                        c. between                       d. in

24. ……………..did Lan go to the dentist’s last week? – Because she had a bad toothache.

     a. What                    b. Why                  c.When                            d. Where

25. Would you………….…me to the post office, please?

     a. take                      b. took                   c. taking                           d. Tak

Huỳnh Tấn Khải
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𝓓𝓾𝔂 𝓐𝓷𝓱
19 tháng 8 2021 lúc 10:46

PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

Ta có: \(\left\{{}\begin{matrix}m_{H_2SO_4}=588\cdot5\%=29,4\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\\n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,3}{3}\) \(\Rightarrow\) Al2O3 còn dư

\(\Rightarrow n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)=n_{Al_2O_3\left(dư\right)}\)

\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1\cdot342}{20,4+588-0,1\cdot102}\cdot100\%\approx5,72\%\)

haruchiyo sanzu
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Khinh Yên
31 tháng 12 2021 lúc 7:16

d

Trường Sinh 6A / Trường...
25 tháng 3 2022 lúc 19:27

Thấy gì đâu??

☞Tᖇì  ᑎGâᗰ ☜
25 tháng 3 2022 lúc 19:28

._.?

lê thị thu thảo
25 tháng 3 2022 lúc 19:55

????

Linh Mochi
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Đỗ Thanh Hải
17 tháng 10 2021 lúc 21:27

1. A. purchase                    B. husband                      C. lunch                        D. love

2. A. education                   B. question                     C. information             D. occupation

3. A. plough                       B. housewife                    C. about                     D. neighbour

4. A. fellow                       B. harrow                        C. nowadays               D. tomorrow

B.Choose the word which is stressed different from the rest

5.  A. routine                   B. alarm                           C. exact                     D. kitchen

6. A. literature                B. geography                   C. physics                  D. chemistry

7. A. content                  B. buffalo                         C. peasant                 D. local

8. A. harrow                  B. neighbour                     C. children              D. tobacco

nhi lê
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Nguyễn Hoàng Minh
21 tháng 10 2021 lúc 7:49

\(d,ĐK:x\ge1\\ PT\Leftrightarrow\sqrt{x-1}=2+\sqrt{x+1}\\ \Leftrightarrow x-1=2+x+1+4\sqrt{x+1}\\ \Leftrightarrow4\sqrt{x+1}=-4\Leftrightarrow x\in\varnothing\left(4\sqrt{x+1}\ge0\right)\\ g,ĐK:x\ge\dfrac{1}{2}\\ PT\Leftrightarrow x+\sqrt{2x-1}+x-\sqrt{2x-1}+2\sqrt{\left(x+\sqrt{2x-1}\right)\left(x-\sqrt{2x-1}\right)}=2\\ \Leftrightarrow2x+2\sqrt{x^2-2x+1}=2\\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=\dfrac{2-2x}{2}=1-x\\ \Leftrightarrow\left|x-1\right|=1-x\\ \Leftrightarrow\left[{}\begin{matrix}x-1=1-x\left(x\ge1\right)\\x-1=x-1\left(x< 1\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x\in R\end{matrix}\right.\)

 

Chimiha
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(.I_CAN_FLY.)
23 tháng 2 2022 lúc 17:31

1A

2D

3A

4C

5B

 

1C

2B

3C

4D

5B

Li An Li An ruler of hel...
23 tháng 2 2022 lúc 17:34

A.island B.sports C.bookstore D.sister

2.A.see B.free C.agree D.coffee

A.raised B.practised C.promised D.increased

4 A.dad B.hat C.plant D. happy

5. B

IV. Choose the letter (A/ B/ C or D) next to the word whose main stress is placed differently from the others. (10 points)

1.  A. happen

2.  A. variety

3.  A. moderate

4.  A. writer

5. A. movie

B. study

B. sensible

B. simple

B. baker

B. tomorrow

C. appear

C. appointment

C. invite

C. builder

C. theater

D. wonder

D. continue

D. doctor

D. career

D. moment