user-avatar
nhacbatquan2701
2 năm trước
cho phương trình: x^2-mx-2=0(m là tham số). tìm các giá trị của m để phương trình có 2 nghiệm phân biệt x1,x2 sao cho x1-2x2=5
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Bài 7: Khoanh tròn vào đáp án đúng. 1. I (used to/ use to) collect stamps when I was nine years old. 2. My father (used to/ use to) be an excellent student at university. 3. I didn’t (used to/ use to) eat with chopsticks when I lived in America. 4. Did they (used to/ use to) work in a big factory before their retirement? 5. Peter (used to/ use to) drive to work but now he doesn’t. 6. My younger brother didn’t use (walk/ to walk) to school 7. My classmates didn’t (used to/ use to) like me. 8. There (used to/ use to) be a lot of trees along this street. 9. Horse and cart used to (be/is) the main way of transportation. 10. Coffee didn’t (used to/ use to) be my favorite drink. 11. Did Sarah (used to/ use to) be Mr Vu’s student? 12. My grandmother (used to travel/ use to travel) a lot before she got married. 13. Mr Ha(used to/ use to) work in Japan for 3 years. 14. I didn’t (like used to/ use to like) reading books. 15. Did Jim and Jane (used to/ use to) hate each other?

Complete the sentences with the give verbs 1. The baby .......................at the moment.(sleep) 2. Alex............................a novel now.(read) 3. She............................hard.(work) 4. Kevin ..............................tennis now.(play) 5. The telephone ................................(ring) 6. The birds .................................south. (fly) 7. Edward .....................................problem now. (solve) 8. Peter .......................................with Ali.(talk) 9. I ..........................................my breakfast now. (have) 10.Gordon ....................................an apple now.(eat) Dear George and John, We went to the seaside last weekend. we had a great time ! We swam and played beach volleyball all day.Last night we ate fish? Do you like fish? My cousins came with us, too. My mother and my father set under the umbrella all day. Dad read a book and Mum wrote some postcards.I collected some seashells and brought them to home. We miss you! Love Helen 1. Did they go to seaside? ................................................................... 2. Did they like their holiday? ................................................................ 3. What did they all do? ...................................................................... 4. Did they eat fish or chicken? .............................................................. 5. What did her cousin do? ................................................................... 6. What did her mum and dad do? ............................................................ What did she collect? ...................................................................... CHia động từ ở thì tương lai đơn 1. I can’t go with you this afternoon. I ___________________ (go) to the dentist. 2. I have to search information about Afrika. I _____________________ (help) you. 3. Why are you wearing trainers. Because I __________________ (play) tennis. 4. In the future the rain forest ______________________ (completely/disappear). 5. Peter is very pale. He ___________________ (faint). 6. I ___________________________ (meet) my friends tonight. 7. The teacher is really angry with Tom. He _____________________ (call) his parents. 8. Watch out! You _______________________ (fall) over. 9. Next summer, I _____________________ (visit) my grandparents in B

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