Một xí nghiệp dự định sản xuất 600 sản phẩm trong một thời gian nhất định. Do thi đua, xí nghiệp đã tăng năng suất thêm 5 sản phẩm mỗi ngày nên đã hoàn thành kế hoạch trước thời hạn 6 ngày. Tính năng suất dự kiến của xí nghiệp đó.

Rút gọn: (ab+ac)(a² - c²) + (bc + ba)(c²-a²)

Bài 5 cho hình thang cân ABCD (AB//CD) có AB=1/2 CD, Cho AB=6cm BC=5cm a) tính chu vi hình thang. b) tính đường cao AH và diện tích Hình thang c) gọi O là Giao Điểm Của AC và BD đường thẳng qua O và song song với đáy hình thang cắt BC tại M tính BM d C/M AC/OD+BD/OD=3

I. Choose the word Whose underlined party is pronounced differently 1.a.wanted b. looked c. missed d. wrapped 6.a. earned b. lived c. stopped d. cried 2.a.prefered b. joined c. played d. smocked 7.a. closed b. suggested c. booked d. grouped 3.a. needed b. planted c. cooked d. naked 8.a.watched b. wretched c. wasted d. waited 4.a. worked b. mastered c. kissed d. kicked 9.a. agreed b. cleaned c. disliked d. admired 5.a. greeted b. rained c. painted d. heated 10.a. asked b. helped c. practiced d. tried

Cho đường tròn (O), đường kính AB=10cm. Gọi H là một điểm thuộc bán kính OA. Kẻ dây CD đi qua H và vuông góc với OA. a) tính diện tích tứ giác ACBD, biết OH=3cm

Phân tích thành nhân tử 1 e, f 💨🍃🍃🍃🍃🍃💨💨💨💨💨💨💨🍃🍃🍃

giúp em làm mấy câu tỉ lệ thức vs ạ a) 12.20=15.16 b) 2,4.3,2=8.0,96 c) -5/15=-1,2/3/6

HOW THE POP SONG OF TOMORROW ARE CHOSEN Teenagers in America buy millions of records every year so it is (41) _______ surprising that manufacturers find it (42) __________ to try out the recordings they have made in front of live audiences before (43) _________ the records on the market. The (44) _________ way of doing this is the one employed in Hollywood, where hundreds of (45) _________ are invited to listen to test records and given dials that measure their response to them electrically. Everyone who goes to the sessions enjoys them, (46) ________ they are not paid for their help. They think they are being given an opportunity to (47) _________ the manufacturers what they like. They say that there (48) __________ be more sessions like this. It there (49) ________ , the song that are published would be better and they (50) ________ hear so much rubbish on the radio. 41. A. almost B. hardly C. even D. nearly 42. A. being useful B. to be useful C. useful D. that it is useful 43. A. put B. they are putting C. to put D. putting 44. A. most effective B. more effective C. effectiveness D. effected 45. A. youngs B. young people C. the youth D. the youths 46. A. although B. in spite of C. however D. nevertheless 47. A. explain B. inform C. tell D. say 48. A. would B. should C. shall D. ought 49. A. are B. were C. was D. had 50. A. shouldn’t B. mustn’t C. ought not to D. wouldn’t have to

Read the following passage and mark the letter A, B, c, or D to indicate the correct word that best fits each of the numbered blanks. Healthy Eating A healthy diet helps (23) the way to a healthy heart and blood vessels, strong bones and muscles, a sharp mind, and so much more. Confused about what constitutes a healthy diet? You aren't alone. Over the years, what seemed to be flip flops from medical research combined with the flood of diet books and diet plans based on little or no science have muddied the water. But a consensus has emerged about the basics, (24) are really pretty simple. An important take-home message is to focus (25) the types of foods you eat and your overall dietary pattern, instead of on individual nutrients such as fat, dietary cholesterol, or specific vitamins. There (26) no single nutrients or vitamins that can make you healthy. Instead, there is a short list of key food types that together can dramatically reduce your risk for heart disease. Eat more of these foods: fruits and vegetables, whole grains, fish and seafood, vegetable oils, beans, nuts, and seeds. Eat less of these foods: whole milk and other full-fat dairy foods, red meat, processed meats, (27) refined and processed grains and sugars, and sugary drinks. Question 23: A. pave Question 24. A. which B. build B. what C. make C. who D. tile D. that Question 25. A. in B. on C. of D. at Question 26. A. were B. was C. are D. is Question 27. A. generally B. largely C. strongly D. highly

Bài 2: Trình bày phương pháp hóa học phân biệt ba oxit BaO, P2O5, MgO đựng trong các lọ riêng biệt. Mn giúp e vs ạ