user-avatar
bambibosua
2 năm trước
Cho hệ pt: x+y=4 x-ay=2 a, giải hệ pt sau khi a =1 bvới giá trị nào của a thì hpt sau có 1 nghiệm duy nhất
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Khoanh tròn đáp án đúng 1. The Smith (is having/ are having) a barbecue in the backyard right now. 2. The train (just leaves/ has just left) for 10 minutes. 3. The police (haven’t caught/ hasn’t caught) the burglars yet. 4. Jim (is still reading/ has still read) the book he borrowed from the local library last week. 5. (Have you ever tried/ Are you ever trying) Indian cuisine before? No, this is my first time. 6. At present, my father (is having/ has) a car and a motorbike. 7. You should arrive at the airport before &:30 because the plane (takes off/ are taking off) at sharp 8. 8. Who (is/are) James talking to? 9. I (have read/read) five science books so far. 10. Coffee (has always been/ is always) my favorite drink since I was 20. 11. Why (are you always talking/ do you always talk) with your mouth full? 12. What (are you doing/ do you do) now? I am a linguist. 13. Look! It (is pouring/ pours) with rain. 14. Have you finished your homework yet? No, actually I (am working/ work) on it. 15. Mr. Brown (is sleeping/ has slept). I can hear his loud snoring.

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