Cho mình ctlhn nha
`1/(9a^2+1)=1-(9a^2)/(9a^2+1)≥1-(9a^2)/(6a)≥1-(3a)/(2)`
tương tự :
`1/(9b^2+1)≥1-(3b)/2`
`1/(9c^2+1)≥1-(3c)/2`
`⇒1/(9a^2+1)+1/(9b^2+1)+1/(9c^2+1)≥3-(3(c+b+a))/2`
`⇒1/(9a^2+1)+1/(9b^2+1)+1/(9c^2+1)≥3-3/2=3/2`
`''=''`xẩy ra khi :`a=b=c=1/3`
vẽ choa mình 1 bé mèo nhen ( xinh vô ná ) N/L: ncl ăn cơm trước kẻng khổ lắm đấy nên mai sau đừng như thế nhá để cho cái người ngỏ lời muốn cùng mình đi hết quãng đường á . Nếu có bị cán dỗ nhớ dùng pp bảo hộ nhá ( cảm thấy phẫn nộ khi có 1 số người mang cái đó ra làm trò cười :))
cho 0,3 (mol) hh X gồm 2 este đơn chức tác dụng vừa đủ với 250ml dd KOH 2M thu được Y (no, đơn chức, mạch hở, tham gia pứ tráng bạc) và 53g hh muối. Đốt cháy toàn bộ Y cần vừa đủ 5,6l O2. Khối lượng 0,3 (mol) X =?
Giúp câu d) ...................
2 xe ô tô khởi hành đồng thời từ A và B cách nhau 80km. Nếu đi cùng chiều về C thì sau 1h40p 2 xe cách nhau 120km. Nếu đi ngược chiều thì sau 30p cách nhau 20km. Tìm vận tốc mỗi xe Vẽ hình giúp mình!!!
If we keep on..................................the sea, marine life will be in danger. (pollute) People............... are advised to strictly follow the Ministry of Health's 5K message.( nation)
Giúp mình bài này với Mình cảm ơn ạ:)
READING 1 SAU KHI LÀM ĐIỀN TỪ, CÁC BẠN DỊCH RA TIẾNG VIỆT VÀO VỞ. JACK LONDON Jack London (1876 – 1916) is an American writer whose work combined powerful realism and humanitarian sentiment. He was (16) ........ in San Francisco. After finishing grammar (17) ..........., Jack London worked at various jobs and in 1897 and 1898 he participated (18)........... the Alaska Gold Rush. Upon his return to the San Francisco area, he began to (19) ............ about his experiences. A collection of his short stories, The Son of the Golf, was (20) ............ in 1900. Jack’s colourful life, during which he wrote more than 50 books and which included enormous popular successes as an (21) .........., ended in his suicide at the (22) ........... of 40. Many of his stories including his masterpiece The Call of the Wild deal with the reversion of a civilized creature to the primitive state. Jack London’s style – brutal, vivid and exciting – (23) ........... him enormously popular outside the United States; His (24) ........ were translated into many languages. Jack’s important works include People of the Abyss about the poor in London; the Sea Wolf, a novel based on the author’s experiences on a seal hunting ship; John Barleycorn , an autobiographical novel about Jack’s struggle (25)............. alcoholism. 1: A. grown B. born C. developed D. lived 2: A. lessons B. course C. notes D. school 3: A. in B. to C. at D. of 4: A. speak B. read C. talk D. write 5: A. printed B. ordered C. sold D. published 6: A. architect B. author C. actor D. orator 7: A. moment B. age C. time D. year 8: A. gave B. let C. made D. did 9: A. speeches B. sayings C. words D. works 10: A. to B. for C. against D. of WATER There’s much more water than land on the (31) ___ of the earth. The seas and oceans cover nearly (32) ___ of the whole world, and only one-fifth of (33) ___ land. If you traveled over the earth in different directions, you would have to spend (34) ___ more of your time (35) ___ on water that on roads or railways. We sometimes forget that for every mile of land (36) ___ four miles of water. There’s so much water in the surface of our earth that we (37) ___ to use two words to describe. We use the word SEAS (38) ___ those parts of water surface which (39) ___ only few hundreds of mile, the word OCEANS to describe the huge area of water (40) ___ are thousands of miles wide and very deep. 1. A. cover B. surface C. outer D. outside 2. A. four-fives B. four-fifth C. four fifths D. fourth-fifths 3. A. it is B. it’s C. its D. them are 4. A. many B. much C. few D. too 5. A. to move B. move C. moved D. moving 6. A. there are B. there is C. there has D. have 7. A. must B. should C. have D. would 8. A. describing B. describes C. describe D. to describe 9. A. is B. are C. has D. will be 10. A. that’s B. which C. where D. whose
mai phải nộp rồi huhuhu đã thế mẹ bắt làm xong mới được đi ngủ!
Nốt số đ cuối cùng:( Honngs các thiên tài toán học như anh quangcuong. Làm theo kiểu lp 5 nhé❤❤❤
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