Câu1:Cho(O;6cm),M là một điểm cách điểm O một khoảng 10cm.Qua M kẻ tiếp tuyến vs (O).Tính khoảng cách từ M đến tiếp điểm. Câu2: Cho đường thẳng d:y=ax+2 đi qua điểm E(1;1).Tìm hệ số góc của đường thẳng d. (mọi ng giúp e vs ạ)

Viết PTHH cho những chuyển đổi hh. CuO---->CuSO4--->Cu(NO3)2--->Cu(OH)2---->CuO--->CuCl2--->Cu (mọi ng giúp e với ạ)

Trung hoà 400ml dung dịch H2SO4 1M bằng dd NaOH 0,5M. a)Viết pt phản ứng hh xảy ra. b)Tính thể tích dd NaOH 0,5M đã dùng c)Tính nồng độ mol/lít dung dịch thu được sau phản ứng. (Mọi người giúp e vs ạ)

Câu7:Có 3 lọ mất nhãn,mỗi lọ đựng 1 trong các dung dịch sau:NaOH,Na2SO4,NaCL.Hãy trình bày phương pháp hóa học để nhận biết chất trong mỗi lọ.Viết PTHH Câu8:Viết các pt thực hiện chuyển đổi hh sau(ghi đk nếu có): S--->SO2----->SO3----H2SO4---->MgSO4 Câu9:Trộn 200ml dd CuSO4 0,25M với V dd NaOH 0,5M thì vừa đủ.Sau phản ứng thu được kết tủa A và dd B. a)Hãy cho bt hiện tượng quan sát đc và viết PTHH b)Tính khối lượng kết tủa A c)Tính nồng độ mol của chất có trong dd B(coi thể tích dd thay đổi ko đáng kể) Câu10:Viết PTHH thực hiện những chuyển đổi sau(ghi đk nếu có): CaCO3--->CaO--->Ca(OH)2--->CaSO3-->SO2. Câu11:Có 3 lọ ko nhãn,mỗi lọ đựng 1 chất rắn sau:NaCL,Ba(OH)2,KOH.Hãy trình bày cách nhận biết chất đựng trong mỗi lọ bằng phương pháp hóa học.Viết PTHH(nếu có) Câu12:Cho 18,6g natri oxit tác dụng hết với nước thu đc 1,5l dd A a)Tính nồng độ mol của dd A thu đc b)Nếu trung hoà hết dd A nói trên bằng dd HCL 10%,có khối lượng riêng 1,05g/mol thì cần bao nhiêu ml dd HCL. (Mọi người giúp e với ạ)

Cho tam giác ABC vuông tại A,đường cao AH(H thuộc BC);AB=2,AC=3CH.Diện tích tam giác ABC là bao nhiêu? (Mọi người giúp e vs)

V:Read the passage then answer the questions below. New York city is located in the southeastern part of New York State just east of New Jersey.The city was founded by the Dutch in 1624.At first it was called Fort Amsterdam,and then New Amsterdam.In 1664,the English took over the city and renamed ít New York.With the population of more than 7 million in the city and 19 million in the metropolitan region,New York is the largest city in the United States.It is divied in to five parts,which are Manhattan,the Bronx,Brooklyn,Queens,and State Island.The total area of these parts is 1946 square kilometers.Visitors to New York are all attracted by places such as the Statue of Liberty,the Empire State Building,Time Square,Wall Street,and Broad way theatre district.New York is also where tourists can visit some world famous art galleries and museums Questions: 1.Where is New York city? 2.Who founded this city? 3.What is it's population? 4.Are visitors to New York attracted by some places? VI:Rewrite the following sentences 1.Barbara cooks better than Mike does =>Mike doesn't......... 2."I am on my way" said he =>He said...... 3.When you come inside you should take off your coat and hát (remove) =>When...... 4.They offered him a place at the company but he turned it down(refused) =>They....... VIII:Complete the second sentence in each pair so that it has similar meaning to the first sentence. 1.I arrived on time in spite of the bad traffic =>Although..... 2.David has good relationship with most of his colleagues =>David gets...... 3.Lan was ill,so she didn't go to Dong Ho village with her friends =>Because... 4.The children are eager to visit Hue next week =>The children are looking..... 5.I'll give you a call immediately I have finished my work =>As soon...... VIII:Circle the world marked A,B,C or D with a different stress pattern from the others 1.A.urban. B.asset. C.metro. D.conduct 2.A.factor. B.medium. C.conflict D.downtown 3.A.fabulous. B.indicator. C.determine. D.forbidden 4.A.negative. B.indicator. C.determine. D.skyscraper 5.A.metropolitan. b.affordable. C.oceania. D.multicultural IV: Complete each of the following sentences with comparatives or superlatives.Add 'the' where necessary 1.I think this is(noisy)....part of the city 2.This place was(dangerous)....than we thought 3.Could you showe the way to(near)...bus stop? 4.The trip to Ho Chi Minh City was(interesting)....for us 5.This is(good)....food I've ever eaten in the country 6.I had to drive my car along(narrow).....road in the region 7.Quan's house is (far).....from the city centre than my house (Mọi người giúp e vs ạ e cần gấp)

I:Find the word which has a different sound in the part underlined. 1.A talked. b.watched. c.lived. d.stopped (Phát âm Ed) 2.A.university. b.unique. c.unit. d.undo (Phát âm "u") 3. A lose. B.move. c.stove. D.improve (Phát âm "o") 4.A.machine. B.chair. c.check. d.child (Phát âm "ch") II:Choose the correct answer A,B,C or D to finish the sentences 1.the doll has been...out of clay A.embroider. B.cast. C.woven. D.muolded 2.she turned...the new job in New York because she didn't want to move A.on. B.down. C.off. D.up 3.this laptop is much more user-friendly,but it costs...the other one A.so much as B.as many as. C.twice as much as. D.twice as many 4.After I found all the information I needed,I...the computer. A.turned up. B.switched on. C.looked for. D.put off 5.Mary is sad....she has lost her calculator A even though. B.so. C.but. D.because 6.Which city is the oldest? A.Ha Noi. B.Hue. C.Can Tho. D.Bac Ninh III:Put the verbs in brackets in the correct tense form. 1.Thank you so much for(show) me around today. 2.It is the first time I (ever/see)........such a beautiful skirt. 3.Rice(grow)in tropical countries. 4.I'm looking forward to(see) you again soon IV:Give the correct form of words in the brackets. 1.What is the(small)country in the world?I think it's Monaco 2.New York is a multi-(culture)city.It has people from all over the world living in it 3.We must face up to that our handicrafts are in (compete) with those of other village 4.This hand-(embroider)picture was too expensive for us to buy. (Mọi ng giúp e vs ạ)