Thấu kính hội tụ có tiêu cự 18 cm. Một vật sáng AB đặt vuông góc trục chính của thấu kính hội tụ cách 6 cm a, Vẽ ảnh của vật AB qua thấu kính hội tụ và xác định tính chất ảnh. b, Xác định vị trí ảnh của vật AB so với thấu kính hội tụ. Help me pls!!!

Trinhc bày suy nghĩ của em vì ý kiến cho rằng : mạng xã hội là con dao 2 lưỡi. Vì ko đủ điểm nên tôi i lm vậy. Tôi yếu Văn lắm 5sao cho ai lm hay, ko chép mạng nhiều .c.on

I/. Choose one word whose underlined part is pronounced differently from the others: 1. A. sure B. saw C. send D. sit 2. A. new B. sew C. few D. knew 3. A. image B. arcade C. take D. days 4. A. plays B. looks C. wants D. helps 5. A. decided B. preferred C. listened D. enjoyed 6. A. much B. drug C. buffalo D. future 7. A. horrible B. hour C. hundred D. hold 8. A. teenager B. together C. guess D. regular 9. A. languages B. goes C. watches D. dresses 10. A. education B. collection C. question D. celebration II/.Fill in each blank with the correct form of the word given in capital: 1/. English is an ………………… and important subject INTEREST. 2/. In electronics they learn to repair ……………appliances. HOUSE 3/. The most popular ………….. at recess is talking . ACT 4/. Hoa is having a....................check-up MEDICINE 5/. In the countryside, people often know all the people in their................ NEIGHBOR 6/. You must be careful when playing video games because they can be ………. ADDICT 7/. I’d like a nice..................orange JUICE 8/. Edison’s most famous ………. was the electronic bulb. INVENT 9/. This dictionary is very ..............for you to learn English USE 10/. I have ....................time to play than my friends LITTLE III/. Choose the best answer to complete each sentence. 1/. I bought this dress at the...................on Hang Bai street. A. clothes’ store B. store of closes C. clothes store D. closing store 2/. Isn’t it easy to learn English well? - ……………………….. A. No, it is B. No it does not C. Yes, it is D. Yes. It does 3/. There are two churches in the town and ………………of them are extremely old. A. each B. all C. both D. most 4/. My joke made the whole class ……………… A. smile B. laughing C. laugh D. crying 5/. Mr. Nam ………………….. to work yesterday A. wasn’t drive B. not drive C. didn’t drove D. didn’t drive 6/. The news on TV last night ……………………. very good. A. was B. has C. were D. be 7/. Lan did not know the world . Hoa didn’t ……………………………. A. so B. neither C. either D. too 8/. The boss wants his ………………….. to type some letters. A. secretary B. novelist C. journalist D. musician 9/. If he eats all that food, he eats……………………… A. quite much B. too many C. quite many D. too much 10/. Mr Robinson speaks Vietnamese very…………………….. A. skillfully B. good C. fluently D. best

Bài 1 cho a^2 = ab, b^2=ac trong đó a,b,c khác 0 ,a+b+c khác 0 tính giá trị biểu thức A=a^1000.b^1018 trên c^2018 Bài 2 Cho a+b chia hết cho 2 thuộc z. Chứng minh rằng a+3b chia hết cho 2 Bài 3 Chứng minh rằng P là số nguyên tố lớn hơn thì ( p-1).(p+1) chia hết cho 24 MN GIÚP MÌNH VỚI Ạ Hỏi

Giúp mình vs ah ai làm đúng mk vote 5****** và cho ctlhn nha thanks

cho biểu thức A=(x^2+2)/(2x+10)+(x+5)/(x)+(50-5x)/[2x*(x+5)] a, tìm điều kiện của x để giá trị của A được xác định. b,tìm giá trị của x để A=1;A=-3. (mn giúp e với ạ, em đang cần gấp ạ🙏, e sẽ vote 5 sao ạ)

Khối lượng KMnO4 cần dùng để điều chế 1,12 lít khí oxi là: A.7,9 gam B.15,8 gam C.3,95 gam D.14,2 gam

Giúp mk vs ,ai giúp mk , mk sẽ vote 5***** cho

X. Use the suggested words and phrases to write complete sentences. (10points) Dear Nam, 1. I / be / pleased / hear / that / you / your family / well. ………………………………………………………………………………............................. 2. Here / photo / my family / and / let / me / tell / you / us. ……………………………………………………………………………….............................. 3. Father / mechanic /. He / work / factory / suburb. ………………………………………………………………………………............................. 4. He / work / five / days / a week / Monday / Friday. ………………………………………………………………………………............................. 5. He usually /go / work / motorbike / morning / so he / not free / every morning. …………………………………………………………............................................................. …………………………………………………………............................................................. 6. In free time / father/ often / play/ badminton / friends. ……………………………………………………………………………… 7. mother / teacher//. She / teach / Math / school / near / house. …………………………………………………………………………………… 8. Brother / 17 years/ and / he / grade 12. …………………………………………………………………………… 9. He / love / collect /stamps /. He / have / hundreds / stamps / collection. ……………………………………………………………………………… 10. please write / me soon / and tell / your / family. ………………………………………………………………………………

VII. Complete the second sentences in such a way that it is almost the same as the first. (10 points) 1.Lan’s hair is long.  Lan ................................................................................................................................ 2.Nam rides his bike to school everyday.  Nam............................................................................................................................... 3.Nobody in our class is more intelligent than Nga.  Nga............................................................................................................................... 4.Let’s go swimming.  Shall ........................................................................................................................? 5.When is your brithday?  What...........................................................................................................................? 6. How tall is this building?  What...........................................................................................................................? 7. Miss Lan is a good English teacher.  Miss Lan ….................................................................................................................. 8. It took Mr. Hoang half an hour to walk to work to yesterday.  Mr. Hoang spent....................................................................................................... 9. What is the price of this cap ?  How much........................................................................................................................ 10. Listening to music is more interesting than watching TV.  I prefer............................................................................................................................. VIII. Read the passage and choose the best option. Cirle A, B, C or D? (10points) James has two jobs. (1)………….Monday, Tuesday and Wednesday he works in a (2)……….where he helps to look after children who (3)………..ill. He goes to the hospital (4)………bus. He starts (5)………at ten o’clock and works until quarter (6)……….five. He (7)………at home on Thursday and Friday, he writes stories. In (8)……… evening, one of his roommates cooks the meal. After dinner, they (9)…………at the newspapers to see what’s on TV or they (10)…………about the day. 1. A. At B. In C. On D. Up 2. A. school B. hospital C. office D. factory 3. A. am B. is C. are D. be 4. A. in B. on C. under D. by 5. A. job B. day C. hand D. work 6. A. to B. at C. by D. about 7. A. work B. works C. working D. to work 8. A. a B. an C. O D. the 9. A. see B. watch C. look D. meet 10. A. sing B. talk C. hear D. listen IX. Fill in each gap with a suitable preposition.(10points) 1. I’m reading a book …................ history of China. 2. The shirt looked beautiful. I tried it…..............but it didn’t fit. 3. It is far…..........................your house to the school. 4. Is Tokyo the biggest city…............................the world. 5. John’s worried ….......................his final exam. 6. Are you interested…...................... Math. 7. What’s HCM city famous…........................? 8. Her sister is working….......................... a computer company. 9. Can I talk ............................. you for a moment? 10. My aunt sliced the beef .......................thin strips.