giải hộ em bai 18 19 vói ạ em cám ơn

$\frac{2x+3}{3x+1}$ = $\frac{3}{4}$ nhanh dùm mk nhé

Mn giải giúp em mấy bài này với bài nào cũng được

Chia động từ trong ngoặc với thì thích hợp 1.You (like) documentary films? 2.1 (not hear) about that actor yet. 3.1 (go) to the cinema twice a week. 4.The director (work) with his cast in the studio at the moment. 5. We (see) that film since 1999. 6.Yesterday actors and actresses (work) in the rain the whole afternoon. 7.Roberto (live) in Hollywood for 8 years and (appear) in three films. 8.Movies (develop) since the early 1950's? 9.The children (watch) a Disney cartoon when I (get) back yesterday evening 10.Young people often (imitate) the dress fashions of movie stars. 11.What he (do) when you (see) him last Sunday? 12.She sometimes (help) her mother in the kitchen. 13.He was reading a novel when I (call) him. 14.Please be quiet. I (try) to concentrate. 15.I don't know her husband, I never (meet) him. 16. Why he (not come) to my party last night? 17.How many cigarettes you (smoke) a day? 18.You ever (see) a ghost? 19.In my country we (not have) lessons on Sundays. 20. Who (prepare) dinner yesterday? My mother (do). 21. Tom (look) out of the window. What he (think) about? 22.They (live) here for five years. 23. While Bill (eat) dinner, Alicia (come) through the door. 24. While he (walk) to class, he (see) Mrs. Smith yesterday. 25.Gene (eat) dinner when his friend called. 26. John (write) his report last night. 27. Bob (not see) this movie before. 28.How often you (go) to school? 29. Tom's father (teach) him how to drive when he was young. 30. I feel a bit hungry. I think I (have) something to eat.

Phân tích đa thức thành nhân tử bằng phương pháp dùng hằng đẳng thức (A+b)^3-c^3 X^3-x-y^3 X^6-1;x^6+1 X^6-y^6;x^12-y^4 1/27+a^3;1/8x^3-8 27-27m+9m^2-m^3 125-(x+2)^3;x+3^3-8 X+4^3-64;x+1^3-125 X^9-1;x^9+1

phiên âm /'meik 'mɒdlz/ /b3 : n/ (v) /'tʃælmdʒil/ (adj) /heit/ (v) /h3 : t/ / aʊt' dɔ:z/ (adv) /pha : nt/ (v) là từ gì

IV. Kết hợp A với B sao cho phù hợp: A B 1. What are you doing? a. I’m going to get a job 2. What do you usually do after school? b. I often watch TV. 3. What should I do to have a good health? c. Twenty minutes a day. 4. Why don’t you take a rest? You look tired. d. Yes, may be I will. 5. What sport does your brother like doing? e. You should take physical exercises. 6. What are you going to do after the course? f. That’s a good idea. Let’s buy some food and drinks. 7. Should we go to the beach? It’s a beautiful day. g. I’m playing the guitar. 8. How often does he play video games? h. My brother likes playing soccer. * Answer: 1 + . . . . ; 2 + . . . . ; 3 + . . . . ; 4 + . . . . ; 5 + . . . . ; 6 + . . . . ; 7 + . . . . ; 8 + . . . . .

SECTION ONE: USE OF ENGLISH (5.0 pts) Part 1: Choose the best answer (marked A, B, C or D) to finish each of the following sentences. (0) has been done as an example. Write your answers in the numbered boxes below. (3.0 pts) 0. I ___________ a student. A. am B. is C. are D. be 1. We’ll make this beach clean and___________ again. A. beautiful B. beauty C. beautifully D. beautify 2. A lot of fashion designers have ___________ inspiration from Vietnam’s ethnic minorities to make the ao dai more charming. A. taken B. made C. done D. become 3. Tet or the Lunar New Year holiday is the most important ___________ for Vietnamese people. A. celebrate B. celebrating C. celebration D. celebratory 4. I suggest organizing a show to ___________ money to help the poor in our neighbourhood. A. make B. pay C. raise D. gain 5. Peter: “ Why don’t we hang the pictures on energy saving around our school?” Mary: “___________.” A. Because they are beautiful B. Let’s do that C. Yes, I’d love to D. Never mind 6. We are really ___________ that people have spoiled this area. A. happy B. proud C. disappointed D. excited 7. She comes from Da Lat, ___________ is the most beautiful tourist attraction in Vietnam. A. where B. which C. that D. what 8. Tidal waves are the result of an abrupt shift in the underwater ___________ of the earth. A. moment B. movement C. pollution D. development 9. If you want to pass the exam, you ___________ study hard. A. may B. can C. will D. have to 10. Mai said she would go to Hue ___________. A. the next day B. the day before C. next day D. the previous day 11. Ann: “ Congratulations on winning the first prize in the English speaking contest, Trang!” Trang: “___________.” A. I know, thanks B. Of course, thanks C. It’s nice of you to say so D. Don’t mention it 12. If we ___________ wasting water, there will be a shortage of fresh water in a few decades. A. keep up B. go on C. fall through D. turn up 

dịch mã morse ...- -. .... .- .. .. --.- .---- --.. -.-. -.- -... -.-. .... .- ..- --.. .----

So sánh: a) A= $\sqrt{4-\sqrt{15}}$ × (4+ $\sqrt{15}$ ) × ($\sqrt{10}$ - $\sqrt{6}$ ) và $\sqrt{3}$ b) B= $\sqrt{4+\sqrt{7}}$ - $\sqrt{4-\sqrt{7}}$ - $\sqrt{2}$ và 0