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Cho x, y là hai số dương thỏa mãn x+1/y ≤1 Tìm giá trị nhỏ nhất của biểu thức C=32x/y+2011y/x

Combine these pairs of sentences using who, whom, whose, which, that

Giúp tớ với ạ :( cảm ơn rất nhiều

giúp mình với 30 p nữa nộp rồi nhớ là vẽ tranh nha

Tìm hàm số bậc nhất y=ax+b biết đồ thị của hàm số là một đường thẳng có tung độ góc là 3 và cắt trục hoành tại điểm có hoành độ (-4;0)

PASSAGE B. One of the first novels in the history of literature (1) ____________ written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born (2) ____________ London in the family of a rich man. When Daniel was a schoolboy, he began to write stories. After (3) ____________ school, he worked in his father's shop and (4) ____________ articles for newspapers. Defoe visited many countries and met many people. That helped him (5) ____________ in his writings. In 1719, when Defoe was sixty years old, her wrote the novel Robinson Crusoe which (6) ____________ him famous. Defoe used in his book a true story about a sailor who (7) ____________ on an island for four years. Robinson Crusoe in Defoe's novel lived on an island for twenty-eight years. People liked (8) ____________ novel in England and in many other countries, Daniel Defoe wrote other books. (9) ____________, his novel Robinson Crusoe was the (10) ____________ famous. Defoe was not a rich man when he died in 1731. A. has B. have C. was D. were A. in B. at C. on D. from A. coming B. going C. staying D. leaving A. sold B. wrote C. bought D. read A. few B. much C. plenty D. many A, made B. did C. brought D. let A. visited B. came C. went D. lived A. a B. an C. the D. X A. And B. Because C. So D. However A. very B. much C. most D. best

PASSAGE C. Now that we can buy music over the Internet and (1) ____________ tunes when we want, you have to ask yourself (2) ____________ is the point of the city music store? Why would we (3) …………………….. shopping in a music store when we can get everything we need at (4) ____________ Home? Music stores know this and have taken account of the need (5) ____________ change. City music stores are now meeting places and somewhere you can listen to music (6) ____________ at full volume in a way that would irritate your neighbours! Also, stores have managed to get solo artists and bands to come and make appearances at the stores to sign CDs or posters and meet their fans. The stores now appeal to teenagers as they are becoming cool places to hang out and meet their friends (7) ____________ browse music. Of course, the stores can’t (8) ____________ for these activities but they hope that by getting people into the store, they will buy their music the old-fashioned way - and it seems to be working. 1. A. download B. surf C. take D. get down 2. A. why B. where C. what D. when 3. A. do B. make C. go D. buy 4. A. a B. an C. the D. _ 5. A. for B. of C. with D. about 6. A. play B. plays C. playing D. played 7. A. but B. as well as C. for D. with 8. A. pay B. cost C. take D. charge

Hai quả cầu nhỏ mang điện tích đặt cách nhau 3cm trong không khí thì chúng hút nhau bằng một lực 32.10^-3 N. Nếu cho 2 quả cầu này tiếp xúc với nhau thì điện tích của mỗi quả cầu lúc sau là 2.10^-8 C. Tính điện tích của mỗi quả cầu lúc đầu ?

ai giúp mình cới mình cần gấp ạ