cho x,y,z là các số dương thay đổi thỏa mãn xy+yz+zx=5. Tìm GTNN của T=3x^2+3y^2+z^2

Để đốt cháy hoàn toàn 3,6 gam một ankan X thì phải dùng vừa hết 5,6 lít khí O2 (đktc) tìm công thứ phân tử của X

Cứu mình với ạ !!!!!!!!!!!!!!!!!!!!!!!!

Mọi người ơi giúp mình câu 3 với

B. VOCABULARY AND GRAMMAR I. Choose the best answer to complete each sentence. 7) The teaching of history shouldn’t be ...................... to date and figures. A. limiting B. limitation C. limit D. limited 8) We don’t have the......................... to update our computer software. A. sources B. resources C. funds D. origins 9) One third of the world’s ........................... consumes two thirds of the world resources. A. people B. men C. population D. human 10) The practice of controlling the number of children a person has, using various methods of contraception is called .............................. . A. family planning B. birth control C. population D. A & B 11) When a person has an infectious disease, he is..........from other people. A. isolated B. limited C. separated D. confined 12) Since the early 1990s Viet Nam has experienced ................... growth but the differences between the lives of the rich and the poor have been greater. A. population B. economic C. educational D. financial 13) A person who has moved from one place to another especially to find work. A. emigrant B. immigrant C. migrant D. A & C 14) What’s the .......................... of your country? A. populate B. population C. populous D. popular 15) If the ball .......... the line, that would have been the end of the game. A. would cross B. will cross C. had crossed D. crossed 16) If someone knocked a candle over, it ...................... a fire. A. will start B. started C. would start D. would have started 17) If you ......................... told us about the bad service, we would have eaten there. A. hadn’t B. don’t C. didn’t D. wouldn’t have 18) What would Tom do if he ............................... the truth? A. would know B. knows C. had known D. knew 19) If I ........................ you were sick. I would have called sooner. A. knew B. had known C. know D. would have known 20) If there ......................... a row, I’m going to keep out of it. A. will be B. is C. were D. had been 21) If I ........................... you, I’d call and apologise. A. am B. were C. would be D. was 22) Jack will win the election if he ......................... harder. A. will campaign B. would campaign C. campaigned D. campaigns II. Choose the underlined part among A, B, C or D that needs correcting. 23) If you were here yesterday, you would have seen Jean. A B C D 24) We should visit that part of the country if it will be spring. A B C D 25) If I will make a difficult decision, I always discuss it with my friends. A B C D 26) We could had done more if we had had more time A B C D 27) He said that if he has more time, he would come to see us. A B C D

Bạn nào biết giải hộ mình giải nhé Mình cảm ơn nhiều ạ

Khi nền sản xuất mới TBCN ra đời trong lòng xã hội phong kiến, mâu thuẫn mới nào nảy sinh? A: Mâu thuẫn giữa chế độ phong kiến với giai cấp tư sản. B: Mâu thuẫn giữa chế độ phong kiến với giai cấp tư sản và các tầng lớp nhân dân. C: Mâu thuẫn giữa chế độ phong kiến với nông dân và thợ thủ công. D: Mâu thuẫn giữa tư sản với các tầng lớp nhân dân.

Các bạn giải hộ mình với : A. PHONETIC I. Choose the word whose underlined part is pronounced differently from that of the other words. 1) A. probably B. population C. gold D. hospital 2) A. smallest B. best C. longest D. biggest 3) A. mountain B. ground C. blouse D. soup II. Choose the word that has stress pattern different from that of the other words. 4) A. instead B. interesting C. expected D. resources 5) A. figure B. double C. different D. support 6) A. research B. decrease C. available D. government

So sánh sự khác nhau giữa văn bản thuyết minh vs các văn bản khác?

Giải bất phương trình x^2-5x+6/x^2+5x+6 >= x+1/x Help me..