Tìm gtln của biểu thức: D=-x^2-xy-y^2+3x+3y

Các bạn giúp mình với còn 15 phút nữa mình nộp mất rồi=((

Tìm giá trị lớn nhất của biểu thức: A = I x - 2018I - Ix - 2017I

Tính thuận tiện : a) 21/11× 22/17× 68/63 b) 5/14× 7/13× 26/25 c) 8/15+ 7/4+ 7/15- 5/4

tìm x a, 350 - ( 60 + x ) : 2 = 300 b, 500 : 10 - 3 . ( x + 7 ) = 20 Làm hai câu này thôi nhanh !!!

I. Complete the sentences with the Present perfect. 1. The bill isn’t right. They (make)………….. a mistake. 2. Don’t you want to see this programme? It …………. (start). 3. I (turn)……….... the heating on. It’ll soon get warm in here. 4. …….....they (pay)…...….. money for your mother yet? 5. Someone (take)………………. my bicycle. 6. Wait for few minutes, please! I (finish)……………. my dinner. 7. ………you ever (eat)………….. Sushi? 8. She (not/come)…………… here for a long time. 9. I (work)………….. here for three years. 10. ………… you ever …………..(be) in New York? 11. You (not/do) ………….yor project yet, I suppose. 12. I (just/ see)………. Andrew and he says he ……..already (do)………. about half of the plan. 13. I ………..just (decide)……… to start working next week. 14. He (be)…………. at his computer for seven hours. 15. She (not/have) ……………any fun a long time.

I. Complete the sentences with the Present perfect. 1. The bill isn’t right. They (make)………….. a mistake. 2. Don’t you want to see this programme? It …………. (start). 3. I (turn)……….... the heating on. It’ll soon get warm in here. 4. …….....they (pay)…...….. money for your mother yet? 5. Someone (take)………………. my bicycle. 6. Wait for few minutes, please! I (finish)……………. my dinner. 7. ………you ever (eat)………….. Sushi? 8. She (not/come)…………… here for a long time. 9. I (work)………….. here for three years. 10. ………… you ever …………..(be) in New York? 11. You (not/do) ………….yor project yet, I suppose. 12. I (just/ see)………. Andrew and he says he ……..already (do)………. about half of the plan. 13. I ………..just (decide)……… to start working next week. 14. He (be)…………. at his computer for seven hours. 15. She (not/have) ……………any fun a long time.

Giúp em bài 1 và 2.2 vs ạ em rất cảm ơn ạ

Calli : Not dân vẽ :> Cho tui xin link của ch Yuungao2k5 đi ạ :>

giải giúp tôi với các bác ưiiii