Tìm giá trị nhỏ nhất A=5+|1/5-x|

Cho tứ giác ABCD . Gọi M,N lần lượt là trung điểm của AB và CD. a)CMR: MN= hoặc < (AD+BC)/2 b)Dấu bằng xảy ra khi nào ?

mọi người giúp em giải bài này với ạ.Em cần gấp..cảm ơn mn nhiều

Write questions to which the words in bold are the answers - <Doris Alder> is Peter's neighbour. She lives <in the house which is opposite his>. She is <67 years old>, but she still does many things for herself. Her favourite hobbies are <knitting and swimming>. She goes swim-ming <twice a week>. Every Saturday morning, Doris and Peter <go shopping> together. They take the bus into town and they come home <by taxi>. Peter admires Doris <because she is a very active person>.

giúp mình với vot 5 sao cho người đầu tiên

Giúp mình câu này với mình cần gấp

1. “I’ll tell you about this tomorrow, Mary.” said Tom. A. Tom said to Mary that he will tell her about that the next day. B. Tom told Mary that I would tell you about that the next day. C. Tom told Mary that he would tell her about that the next day. D. Tom told Mary that she would tell him about that the next day. 2. “I have something to tell you” Mary said to John. A. Mary told John I had something to tell him. B. Mary told John she had something to tell him. C. Mary told John she had had something to tell him. D. Mary told John he had had something to tell her. 3. He said, “My wife has just bought a diamond ring.” A. He said that his wife had just bought a diamond ring. B. He said that my wife had just bought a diamond ring. C. He said that his wife has just bought a diamond ring. D. he said that his wife just bought a diamond ring. 4. “I will come with you as soon as I am ready”, she said to Philip. A. She said to Philip he will come to see you as soon as he I am ready. B. She told Philip she will come to see her as soon as she was ready. C. She told Philip she would come to see you as soon as she was ready. D. She told Philip she would come to see him as soon as she was ready. 5. “I wrote to him yesterday” A. She said to me I wrote to him the day before. B. She told me she wrote to him yesterday. C. She told me she had written to him yesterday. D. She told me she had written to him the day before. 6. The mother told her son ______ so impolitely. A. not behaving B. not to behave C. did not behave D. not behave 7. She said she _________ collect it for me after work. A. would B. did C. will D. had 8. He asked me where I ______________.A. have studied B. study C. am studying D. studied 9. The man wanted to avoid __________ on security cameras. A. to see B. being seen C. seeing D. to be seen 10. Peter said that he had lived in London four years ________ .A. then B. ago C. before D. later 11. John asked me _______________ in English. A. what does this word mean B. what that word means C. what did this word mean D. what that word meant 12. The host asked her _______________ tea or coffee. A. whether she liked B. that she liked C. if she likes D. whether she like 13. My friend asked me who _______________ the piano in the sitting room. A. was playing B. plays C. is playing D. has played 14. The teacher told his students _______________ laughing. A. would stop B. to stop C. stop D. stopped 15. Mary asked me ________________. A. whether I would watch the football match on TV the day before. B. whether I watched the football match on TV the day before. C. If I had watch the football match on TV the day before. D. whether I had watched the football match on TV the day before.

ai giúp em với. làm C1 , C4, C5 THÔI Ạ

mọi người giúp em giải bài này với ạ..em cần gấp .cảm ơn mn nhiều

Cho hai số dương x và y, thoả mãn điều kiện x+y=2. Chứng minh: x²y²(x²+y²) nhỏ hơn hoặc bằng 2