user-avatar
minhtrangtran899
2 năm trước
Cho tam thức bậc 2 : f(x) = -x2 + (m-1)x + m2 - 5m +6 1/ tìm m để pt f(x) =0 có hai nghiệm trái dấu 2/ tìm m để pt : f(x) =0 có 2 nghiệm x1, x2 sao cho x1 + x2 + x1x2 ≥ 0
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Em còn 7 câu này ạ, mong mọi người giúp đỡ, em cảm ơn ạ 21. David was rewarded………..having taken an active part in the Green Summer activities. A. of B. about C. for D. with 22. …………they have used up the fossil fuel resourses in their country, they have to find some types of alternative energy. A. Although B. Since C. Because of D. Despite 23. After they indentified the causes of global warming, they worked out………to reduce its effects. A. solutions B. causes C. effects D. influences 24. Global warming is one of the biggest issues…………humans nowadays. A. faced B. facing C. to face D. to be faced 25. The result of ………..studies show that global warming is real. A. numeral B. numerical C. number D. numerous 26. Having been informed about the bad effects of chemical fertilisers, the farmers……….using them sparingly on their farms. A. start B. are started C. started D.had started 27. The factory was heavily fined for …………..tons of toxic waste into the river. A.having dumped B. dumped C. to be dumped D. to dumped 28. In the USA, about 40% of CO2 emissions …………electricity production. A. come across B. come from C. come about D. come out

EX2: Rewrite the following sentence with the first word (Viết lại câu) 1- I first started to play the guitar when I was 16 (since) I have.............. I was 16 2- This is their first visit to the Greek island.(never) They ....................... .. the Greek island before. 3- This is not our first time at at a rock concert.(already) We................... to a rock concert. 4- She arrived a few minutes ago.( just) She............................................... ........arrived. 5-He came to live here two years ago. (For) He.............................................two years. 6- She hasn't phoned her mother yet. (still) She .................................................. ..........her mother. 7- I started this letter a week ago. ( writing) I.................................... this letter for a week. 8- The snow started this morning and it is still snow. (Been) It................................... since this morning. 9- Tourist first started to visit Iibiza in the 60s. (coming) Tourist ................................ Ibiza since the 1960s. Giúp mình với mình cảm ơn ạ!

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team