Tính nồng độ ion trong các dung dịch sau.

a) Ba (OH)₂   0,2M

b) H₂SO₄ 0,05M ; biết ở hai nấc, độ điện li của H₂SO₄^- là 2% ?

Cho đường tròn (O) và dây AB chia đường tròn thành hai cung thỏa mãn: Cung AmB = 1/3 cung AnB

a) Tính số đo của 2 cung AmB, AnB

b) CM khoảng cách từ tâm O đến dây AB là AB/2

1. Cho tam giác ABC vuông tại A, đường cao AH. Gọi D là điểm đối xứng với A qua điểm B. Trên tia đối của tia HA lấy điểm E sao cho HE = 2HA. Gọi I là hình chiếu của D trên HE.
a) Tính AB, AC, HC , biết AH = 4cm , HB = 3cm
b) Tính \(\tan IED\) , \(\tan HCE\)
c) CMR: góc IED = góc HCE
d) CM: \(DE\perp EC\)

Rewrite sentences

1. It is said that he escaped to a neuteal country
===> He is....................................................................

2. She didn't know the way, so she asked a police man
===> Not

3. There have been fewer people who travel to China by plane. After the mysterious missing Boeing 777 ( Decrease )
===>

4. People think that the prisoner was recaptured while drinking in the pub
===> He is
5. you ought to get your bike brokes repaired immediately ( better )
===>
6. When i left she said that she hoped i had a pleasant jouney ( Wishes)
===>
7. The girl living next to me is getting married next year. ( who )
===>
8. The boy has a determination to study english ( determined )
===>
9. " I don't mind which film we see " I said ( matter )
==>
10. It was wrong of you to allow a four-year-old child to walk home alone
===> You should
11. I could realize how important English is only after i graduated from university
===> Not until
12. Mrs Green is proud of her son's contribution to play last night
===> Mrs Green is proud of what
13. Thanks to Suga's support , I was able to finish the protect
===> Had Suga
14. We have booked 5 rooms , only two of which have air conditioning
===> Only two out
15. There's not poin in asking him for support ( good)
===>
16. Her attitude interests me very much ( Find )
====>
17. John always arives after everyone else ( last )
===>

MỌI NGƯỜI GIÚP EM VỚI Ạ !!!

Part 3 : Complete the sentences with appropriate form of the word
1. ____ are trying to find out new stars. SCIENCE
2. he was turned down for the job beacause he wasn't ____. QUALIFY
3. My colleagues are very pleasant but the manager is a little ____ . FRIEND
4. Teenagers are now _____ dressed . FASHION
5. Some people claim to be able to ____ the future . TELL
Part 4: put the verbs given in the brackets into their appropriate tenses or forms .
6. Jimin did not get used to ( get )____ up early when he first came to Vietnam.
7. By the time your brother ( return )____ here next year , the city will have changed a lot .
8. What tune ( play )____ when we came in ?
9. I wish i ( know ) ____ her address now.
10. They ( learn) ____ English from nine to ten in this room. Don't let anyone disturb them then .
11. The prisoner is thought ( escape ) ____ by climbing over the wall yesterday .
12. five kilometres ( be ) ____ a long way for a little boy to walk .
13. He stepped down from the bench on which he ( stand ) ____- and walked out of the room .
14. He ( serve ) ____ in the ARMY in the last war.
15. She regrets ( not/ buy ) ______ that house . It is much more expensive now.
Part 5 : Find and correct form .
16. The pilice has (A) not decided whether or not ( B) to charge (C) the four young men (D) .
17. Without (A) transportation, our (B) morden sociey (C) could not be existed (D) .
18. She (A) left (B) the room with not (C) saying a (D) word .
19. The more careful (A) you drive , the fewer (B) accidents (C) you will have (D) .
20. The price of (A) crude oil to be a great (B) deal lower (C) than now , wasn't (D) it ?

I. Phonetic
1. A. pleased B. punished C. practiced D. promised
2. A. boot B. root C. shoot D. foot
II. Lexico - Grammar
Part 1 : Chọn đáp án A, B , C, D với đáp án e cho là đúng nhất .
3. Her marriage has been arranged by her parent . She is marrying a man ____
A. She hardly knows him
B . Whom she hardly know him
C. She hardly knows
D. All the correct
4. A fire must have a readily available supply of oxygen. ___ , it will stop burning
A. Consenquently
B. Furthermore
C. Otherwise
D. However
5. Harrods , in london , is probably one of the best- known ____ in the world
A. department stores
B. department shops
C. departmental stores
D. stores department
6. In ____ 22nd SEA Games , Vietnam won ____ 158 gold medals
A. ∅/ the
B. the / ∅
C. a / the
D. the / the
7. you haven't eaten anything since yesterday . You ___ be really hungry
A. might
B. will
C. can
D. must
8. The ring is only made of plastic so it's quite _____
A. valuable
B. invaluable
C. worthless
D. princeless
Part 2. fill in each blank with one suitable preposition
9. Most American men earn ____ average about $ 110 a week
10. He is married _____ my friend
11. You'd better not drink that milk , Joe. It's gone_____
12. Are you you aware ____ the regulations concerning the use of guns ?
13. I used to watch ____ the postman's arrival to seize unwanted envelopes and tear off the corner with stamp stuck on it .

Find and correct the mistake !!!!!!!!!
1. Could you help (A) me do (B) this job? I don't know how to get (C) it start (D) .
2. The man was (A) unable discovering (B) who had thrown (C) stones at (D) him .
3. Many opinion have (A) been express (B) on the likely (C) effects of the computer (D)
4. Traditionally (A) , Americans and (B) Asians have had very different (C) ideas about love and married (D)
5. Many (A) teacher have develped their (B) live to (C) teaching therefore (D) teaching is not a will- paid job
6. Had it not (A) been for you help me (B) , i wouldn't (C) have succeeded (D)
7. There are (A) many different ways of comparing (B) the economy of one nation with those (C) of another (D)
8. The numver of (A) people who (B) survived the Titanic shipwreck (C) in 1912 were (D) quite small
9.If a person really wants (A) to succeed , they (B) must alwways work (C) hard (D)
10. The number of wild condors , an endangered species of (A) bird , have been (B) increasing steadily (C) because of (D) the work of scientists and environentalists

Tìm và sửa lỗi sai !!!!!!
1. Dam are used to control flooding (A) , provide water for irrigation (B) and generating (C) electricity for the surrounding are (D)
2. The closer it gets to (A) December 21 , the first day (B) of winter , the short (C) the days become (D)
3. Either (A) Mr Anderson or (B) Ms Wiggins are (C) going to teach our class today (D)
4.Have you (A) ever read (B) any (C) novels writting (D) by Jack London ?
5. My parent (A) often take careful (B) of me when (C) i am ill (D)
6. Publishing in the UK (A) , the book has won (B) a number of awards in (C) recent regional book fairs (D)
7. Perhaps the most (A) unique thing about (B) carbon atoms are (C) their ability to combine (D) with themselves
8. Her family had great difficulty (A) to get (B) her transferred (C) to another (D) hospital
9. Hardly he had (A) entered the office (B) when he realized (C) that he had forgotten (D) his wallet
10. The economy is heavy (A) dependent on industry (B) , and economic growth has always been (C) of greater concern than (D) environmental preservation