Hòa tan hoàn toàn m gam hỗn hợp X gồm Cu và Fe3O4 trong 500 ml dung dịch H2SO4 nồng độ a mol /l (loãng ) , thu được dd Y. Cho Y tác dụng vừa đủ với dd chứa 1,6 mol NaOH, thu được 52g kết tủa . Tính giá trị của a và m

B1:Giải Pt a) 2011x(5x-1)(4x-30) b)x/2x-6 + x/2x+2 = 2x/(x-3)(x+1)

Phân tích đa thức thành nhân tử 15m ³-5m ²+7m(1-3m)

4.Are the competitors professionals or amateurs? 5.Where and when is the next Olympic Games?

1. We help him every year. =>He 2. She plays badminton in Hoang Hoa very often. => Badminton 3. They usually carve wood in the evening. => Wood 4. Mr. Mathew surfs the Webs on Sunday. => The Webs 5. These boys ride horses every Sunday.(ridden) => Horses 6. They do gymnastics every weekend to keep fit and stay healthy.(done) => Gymnastics 7.Mary has collects bottles every two weeks => Bottles 8. Bat Trang usually makes pottery.(made) => Pottery is usually 9. My parents make models for us in the evening. => Models are 10.David eats a lot of junk food.(eaten) => A lot 11. Hung washes the dishes before meals. => The dishes 12.My sister plays computer games at night. => Computer games 13.We often wear bandage before the games.(worn) => Bandage 14.Watching too much TV hurts your eyes.(hurt) =>Your eyes 15. We fire lots of calories and energy today. => A lot of calories and 16.We help homeles people very often. => Homeless people 17. Disabled people need our help. => Our help 18. He does exercise to keep fit. => Exercise 19. I do not play computer games. => Computer games 20. Elderly people do not eat junk food. => Junk food 21. They show too many advertisements on TV every days.(showed/shown) => Too many 22. They do not clean the beaches very often. => Beaches 23. We don’t look down the poor. => The poor 24. She visits Hue every year. Hue 25. They farm rice here yearly. Rice 26. Mary také a lot of mistakes each semester.(taken) A lot of 27. We donate blood dủing school year. Blood 28. He draws a mural on the wall in June.(drawn) A 29. We do not provide money for them . Money 30. People make lots of musical instrument . Lots 31. Do you show your projects every week? Are

Cho đa thức (x) = x2 + mx + 2. a) Xác định m để đa thức (x) nhận x = –2 làm một nghiệm. b) Với m tìm được ở câu a), tìm tập hợp nghiệm của đa thức (x).

Bài 9:Viết lại câu sau cho nghĩa không đổi, sử dụng cấu trúc so sánh hơn “more /less” 0.Ann speaks French more fluently than James. James speaks French less fluently than Ann. 1.Today the sun shines more brightly than yesterday. 2.This cake is more freshlt made than that one. 3.Jim behaves more politely than his younger brother. 4.Teenagers act more violently these days than in the past. 5.The doctor treats his patiently than he should. 6.My sister speaks more quickly than I. 7.Now Mary drives more carefully than she used to. 8.This summer I go to the beach more often than the last summer.

Giúp nha mọi người, 6 câu trắc nghiệm= 40đ

Vẽ hình và làm câu 2 giúp e với

Phân tích các đa thức sau thành nhân tử a. 36a4-y2 b. 6x2 +x -2