cho biểu thức A= x^2/x+3 ; B= 3x/x-1 - 2x/x+1 + x-3/1-x^2 a) tính giá tri A , biết /x-1/=2 b)rút gọn B c) cho P=A.B , tìm giá trị nhỏ nhất của biểu thức P với x>1

Ngâm một lá đồng trong 20 ml dung dịch bạc nitrat cho tới khi đồng không thể tan thêm được nữa. Lấy lá đồng ra, rửa nhẹ, làm khô và cân thì thấy khối lượng lá đồng tăng thêm 1,52 g. Hãy xác định nồng độ mol của dung dịch bạc nitrat đã dùng (giả thiết toàn bộ lượng bạc giải phóng bám hết vào lá đồng).

PART 6 QUESTIONS 36-40Read the descriptions (36-40) of some parts of the body. What is the word for each description? The first letter is already there. There is one space for each other letter in the word.For questions 36-40, write the words on the answer sheet. 0 This grows on your head. hair 36 You have got two of these with five toes on each one. F _ _ _ 37 You use these for hearing conversation, music and lots of other things. E _ _ _ 38 If you break one of these, you can’t walk, L _ _ _ 39 You open and close this when you talk. M _ _ _ _ 40 If these hurt, you must visit the dentist. T _ _ _ _ help me

Xác định chủ ngữ và vị ngữ trong câu sau và cho biết vì sao lại đặt thế: Dưới gốc tre tua tủa những mầm măng.

Kể những bài văn nghị luận xã hội gần với con người chúng ta nhất

Vật dao động điều hòa với x=9cos(πt-π/3)(cm).Khi vật đi từ vị trí P (Xp=+4.5cm) đến vị trí Q (Xq=-4.5cm) thì tốc độ trung bình là ?

Tìm các cách khác nhau để tính diện tích hình tứ giác ABCD trong hình vẽ dưới đây, iết mỗi ô vuông có cạnh 1 dm.

I.Give correct form of the verbs: 1.Hang (go) to the zoo yesterday, didn’t she ? =>................................................ 2.Hoa (have) an English dictionary, doesn’t she? =>................................................ 3.They were at school, they (be not) ? =>................................................ 4.He isn’t reading a new book now, he (be) ? =>................................................ 5.She (enjoy) eating chocolates, doesn’t she ? =>................................................ 6.We (eat) noodles yesterday,didn’t we ? =>................................................ 7.Nobody was at home, they (be) ? =>................................................ 8.I am doing my homework now, I (be) =>................................................ 9.They (finish) their work yet, haven’t they ? =>................................................ 10.My father (not work) hard every day ? =>................................................’ II.Rewrite these sentences: ( viết lại các câu hỏi thường sang CÂU HỎI ĐUÔI) vd:1.Do you play soccer after school? => You play soccer after school, don’t you ? 2.You have finished your work recently, haven’t you? => Have you ………………………………………………………………………………..? 3.Does he like eating cakes? => He likes ……………………………………………………………………………..? 4.Your father can drive a car, can’t he? => Can your father ………………………………………………………………………..? 5.Did she visit Ha Long Bay last summer ? => She visited ……………………………………………………………………………..? 6.Nam is doing his Math homework now, isn’t he? => Is Nam ………………………………………………………………………………..? 7.He went to the library this morning? => Did he ………………………………………………………………………………..? 8.She stays at home on Sundays, doesn’t she? => Does she ……………………………………………………………………………..? 9.There are many stores in this area, aren’t there? => Are there………………………………………………………………………………..? 10.You should eat less meat, shouldn’t you? => Should you …………………………………………………………………………..? 11.Is this picture very nice? => This picture ……………………………………………………………………………..? 12.Is your mother cooking in the kitchen? => Your mother is …………………………………………………………………………..? 13.Has he met his girl friend yet? => He has ………………………………………………………………………………..? 14.Were you studying at 8 o’clock yesterday? => You ……………………………………………………………………………………..? 15.Lan ate much sugar, didn’t she? => Did Lan ………………………………………………………………………………..? 16.Ba is playing the guitar, isn’t he? => Is Ba ………………………………………………………………………………..? 17.Does your brother have a bike? => Your brother …………………………………………………………………………..? 18. Was she at home yesterday? => She ……………………………………………………………………………………..? 19.Bang didn’t visit Ben Thanh Market last summer, didn’t she? => Did Bang ………………………………………………………………………………..? 20.Could you do me a favor? => You ……………………………………………………………………………………..? 21.Do Ba and Hoa go to English club every Sunday? => Ba and Hoa

III. Choose the best answer 1. Life _________ on another planet. a. might find b. find c. might be found d. are found 2. A new bridge _________ in the area. a. is going to build b. is going to be built c. build d. builds 3. The film _________ for 10 minutes. a. has been shown b. has shown c. show d. shows 4. Homework _________ by Tom every night. a. is done b. does c. do d. done 5. Bill often _________ exercise every morning. a. is done b. does c. do d. did 6. The problem _________. a. can is solved b. can solve c. can be solved d. solved 7. Rice _________ in tropical countries. a. grow b. has grown c. grown d. is grown 8. The house _________ last year. a. is built b. was built c. built d. builds

Vì sao môi trường nhiệt đới gió mùa có độ đa dạng cao hơn so với môi trường đới lạnh và hoang mạc