x^2+2x+1/x^2+2x+2 + x^2+2x+2/x^2+2x+3 = 7/6

tả cảnh đi học lại sau mùa dịch

Cho tam giác ABC có AB = AC, Â𝐴̂< 90° . Vẽ BD ⊥AC tại D, CE ⊥AB tại E. Gọi I là giao điểm của BD và CE. Chứng minh rằng: a) AD = AE b) AI là tia phân giác của góc BAC c) DE //BC, AI⊥DE d) Ba điểm A, I, M thẳng hàng (với M là trung điểm cạnh BC).

Khí X có tỉ khối so với hiđro là 14. Khí X là A. CH4. B. C2H4. C. C2H6. D. C2H2.

Viết đoạn văn có sử dụng câu nghi vấn ( Ko coppy mạng nha )

cả 2 câu nhé ai đúng mik cho cau trả lời hay nhất nhé

Hóa chất dùng để loại bỏ khí etilen có lẫn trong khí metan để thu được khí metan tinh khiết là A.dd brom. B. dd phenolphtalein. C. dd axit clohidric. D. dd nước vôi trong.

Đốt cháy hoàn toàn 29,2 gam hh 2 ankan. Hấp thụ hoàn toàn sản phẩm vào dd Ba(OH)2 thấy KL bình tăng 134,8g. Tính kl CO2 và kl nước tạo thành. Nếu 2 ankan là đồng đẳng kế tiếp hãy xác định CTPT của 2 ankan

Tìm X ? a, X x 3,1 + X x 6,9 + 5,4 = 30,4 b, 31,5 x 0,1 + X x 3 = 7,65

TEST 2 I. Matching. Questions Answers A B C What time is her hair ? 6,000 dong. Where does she go swimming ? My sister. What can I buy some fruit ? At 6.30. Who are a bowl of soup and a fried rice ? A kilo, please. When does Lien do in her free time ? Very well, thanks. How do they go camping ? She watches TV. What color do you want ? At the canteen. How much helps you cook dinner ? At the weekend. How many do you go to school ? Every morning. How often are you ? It's brown. III. Choose the correct answers to finish this dialogue. AHow (much / many) lemons would you like? B Five, please. And (a / some) sugar. A.How (much / many) sugar? B. A small (packet / box), please. A. Is that all or (would / do) you like something else? B. I'll have (any / some) oranges, please. A.These oranges are very fresh. Would you like half a kilo (and / or) a kilo? B.How (many / much) are they? A.15,000 dong a kilo. B.(I'd / I'll) take five, please. A.Certainly. (There / they) are five nice oranges here. IV. Make questions for these answers. 1.Yes, I'd like a cup of coffee, please. 2.A bowl of chicken noodles is 4,000 d 3.Yes. There is some fruit in the fridge. 4.I'm cold and I'm hungry. 5.She has big brown eyes. 6.Mr. Pitt goes jogging 3 times a week. 7.I read and listen to music. 8.We are playing badminton now. 9.Two hundred grams, please. 10.He is a weight lifter. 11.They would like three apples. 12.There's some iced tea to drink after dinner. VII. Finish these sentences in a suitable way. 1.My sister has 2.I'd like 3.We feel 4.He likes 5.Sometimes they 6.Do you always 7.How many bananas 8.How much is VIII. Finish the passage, then make questions and answer them. Quan likes camping. (1).....................the weekend, he often goes camping (2)................... the mountains. He usually goes (3)...................... his friends. Quan and his friends always wear strong boots (4)....................warm clothes. (5).....................always take food, water and a camping stove. Sometimes they (6)......................overnight. It's rather dangerous but fun. 1.What / Quan / like? _ 2.Where / he / often / go? _ 3.He / go / weekdays? _ 4.Who / usually / go / with? _ 5.What / they / wear? _ 6.What / always / take? _ 7.They / ever / camp / overnight? _ 8.Why / they / camp / over night? _