Cho phương trình (m-3)x^2 + (m+2)x-4 , định m để phương trình có hai nghiệm phân biệt thỏa x1 <-2<x2 Mọi người giúp em với ạ em cần gấp ạ

Bài 4: Một thửa ruộng hình chữ nhật có chu vi là 600m, chiều dài gấp 3 lần chiều rộng. Trên thửa ruộng đó, người ta tồng rau bắp cải, mỗi mét vuông thu hoạch được 5kg rau bắp cải. Hỏi trên thửa ruộng đó thu hoạch được bao nhiêu tạ bắp cải? Bài 5: Một mảnh vườn hình chữ nhật có chu vi là 80m, chiều rộng bằng chiều dài. Tính diện tích mảnh vườn đó? Bài 6: Một thửa ruộng hình chữ nhật có chiều dài 15m, chiều rộng bằng chiều dài. Trên thửa ruộng đó, cứ thu hoạch được 10kg cà chua. Hỏi trên thửa ruộng đó người ta thu hoạch được bao nhiêu kg cà chua? Bài 5: Một mảnh vườn hình chữ nhật có chu vi là 80m, chiều rộng bằng chiều dài. Tính diện tích mảnh vườn đó? Bài 6: Một thửa ruộng hình chữ nhật có chiều dài 15m, chiều rộng bằng chiều dài. Trên thửa ruộng đó, cứ thu hoạch được 10kg cà chua. Hỏi trên thửa ruộng đó người ta thu hoạch được bao nhiêu kg cà chua? có j mn báo mik đẻ đối chiếu chứ mik coppy từ word ra nên cố thể mất ảnh phân số

Giúp mình với mình cần gấp và cảm ơn 😅😅

làm hết nhé bà con ....giúp đi , hứa vote 5 sao và ctlhn ạ

PASIVE VOICE EXERCISE 1. Someone has just cleaned the floor. A. The floor has just been cleaned B. The floor has been just cleaned C. The floor is said to be cleaned. D. All are correct. 2. It is believed that the man escaped in a stolen car. A. The man is believed to be escaped in a stolen car. B. The man is believed to have escaped in a stolen car. C. The man was believed to have escaped in a stolen car. D. They believed that the man escaped in a stolen car. 3. “It was thought that the building had been destroyed” means _____. A. The building was thought had been destroyed. B. The building was thought to have been destroyed. C. The building thought to be destroyed. D. They have destroyed the building. 4. People say that he killed his wife A. he is said that he killed his wife C. he said that he killed his wife B. people are said that he killed his wife D. he is said to have killed his wife 5. They didn’t invite me to the party. A. I wasn’t invite to the party. C. I didn’t invited to the party. B. I wasn’t invited to the party. D. I was invited to the party. 6. They are painting the kitchen now. A-The kitchen is being painted now. B-The kitchen is painting now. C-The kitchen is painted now. D-The kitchen being painted now. 7. Tom bought that book yesterday. A. That book was bought by Tom yesterday. B. That book was bought yesterday by Tom. C. That book yesterday was bought by Tom D. That book was bought yesterday. 8. People don’t use this road very often. A. This road is not used very often. B. Not very often this road is not used. C. This road very often is not used. D. This road not very often is used. 9. Mr. Pike is repairing the refrigerator at the moment A. The refrigerator is being repaired at the moment by Mr. Pike B. The refrigerator repaired by Mr. Pike at the moment C. The refrigerator is being repaired by Mr. Pike at the moment D. The refrigerator is being repairing by Mr. Pike at the moment 10. People have discovered a new source of energy A. A new source of energy has discovered B. A new source of energy was discovered C. A new source of energy has been discovered D. A new source of energy has be discovered 11. “They are going to build a supermarket in this area” can be written as: ………………….. A. A supermarket is going to be built in this area B. A supermarket are built in this area C. A supermarket in this area is going to be built. D. This area is going to build a supermarket in 12. They have changed the date of the meeting. A. The date of the meeting has been changed. B. The date of the meeting has been changed by them. C. The meeting has been changed the date. D. The date of the meeting has changed. 13. Somebody will call Mr. Watson tonight. A. Mr. Watson will call somebody tonight. B. Mr. Watson will be call tonight. C. Mr. Watson tonight will call somebody. D. Mr. Watson will be called tonight. 14. People think that Steve stole the money. A. Steve is thought to have stolen the money. B. It was thought that Steve stole the money. C. People are thought that Steve stole the money. D. People think that the money is stolen. 15. We are going to _____________________. A. have our house be decorated B. get our house being redecorated C. have our house redecorated D. have our house to be decorated 16. People believe that 13 is an unlucky number. A. It was believed that 13 is an unlucky number. C. 13 is believed an unlucky number. B. That 13 is an unlucky number is believed. D. It is believed that 13 is an unlucky number 17. It is believed that the man escaped in a stolen car. A. The man is believed to escaped in a stolen car. B. The man is believed to have escaped in a stolen car. C. The man is believed to escaped in a stolen car. D. They believed that the man stole the car. 18. People have translated this book into many languages . a. This book have translated into many languages . b. This book has been translate by people into many languages . c. This book was translated into many languages . d. This book has been translated into many languages .

Em ko bít làm vài này mong anh chị dậy em cách làm ạ. Em cảm ơn

Ai nhanh mình vote 5 sao + cảm ơn + ctlhn

2) Đồng có 2 đồng vị ; , biết tỉ lệ số nguyên tử của chúng lần lượt là 105: 245. Tính nguyên tử khối trung bình của Cu ? 3) Tổng số hạt proton, notron và electron trong nguyên tử của một nguyên tố X là 48. Số hạt mang điện bằng 5/3 lần số hạt không mang điện. a/ Hãy xác định số lượng từng loại hạt trong nguyên tử của nguyên tố. b/ Viết kí hiệu nguyên tử nguyên tố X. c/ Cho biết nguyên tử có mấy lớp electron; số electron trên từng lớp

Em còn có nhiêu điểm thôi mn cố gắng giúp em nha Mn ghi câu trả lời thôi nha

giúp toy với ạ , làm hết dùm nhé,vì bài dễ nên hơi ít điểm ,thông cảm giùm