Cho phương trình: x^2 -2(m-1)x+m-5 , (x là ẩn, m là tham số ). a). CMR phương trình đã cho có hai nghiệm phân biệt x1,x2 với mọi giá trị của m. b). Tìm tất cả các giá trị của m để PT đã cho có hai nghiệm x1,x2 thoả mãn ĐK: x1^2+x2^2=10

làm hộ mik câu C5,C6 SGK Vật Lí 7 trang 54 nhé!

Một khung dây tròn bán kính 0,1m gồm 100 vòng đặt trong từ trường đều, véctơ cảm ứng từ vuông góc với mặt phẳng khung dây. Ban đầu cảm ứng từ có giá trị bằng 0,2.10−2T . Tính suất điện động cảm ứng xuất hiện trong khung trong thời gian 0,01s nếu cảm ứng từ của từ trường giảm đều đến không. A.0,512V B.0,125V C.0,314V D.0,628V

Dành cho bn học giỏi nè . Cần tuyển người học giỏi anh . ( 100 % nhé )

hộ mình với ạ. Mình đang gấp T T

Help me!! (Gấp nha mn, phải có trước 8h 30) Mong mn giúp e vs ạ!!!!

Giúp mình cân bằng phương trình với bốn câu cuối

Đặt câu hỏi cho phần gạch dưới a/I felt (sick) after eating that food. A. How did you felt after eating that food? B. How do you feel after eating that food? C. How did you feel after eating that food? D. How were you feel after eating that food? b/Hoa sometimes helps (her uncle and aunt) with the harvest. A. Who does Hoa sometimes help with the harvest? B. Who does Hoa sometimes helps with the harvest? C. Who is Hoa sometimes help with the harvest? D. Who is Hoa sometimes helping with the harvest? c/ (washed and ironed my clothes by myself) yesterday. A. What do you do yesterday? B. What did you do yesterday? C. What are you do yesterday? D. What will you do yesterday? d/ Lan has an appointment with her friends (at 4 p.m). A. What time does Lan has an appointment with her friends? B. What time is Lan have an appointment with her friends? C. What time is Lan having an appointment with her friends? D. What time does Lan have an appointment with her friends?

1. Answer the questions: 1.Who was doing the medical check-up? 2.What did the nurse do? 3.What was Hoa’s temperature? 4.What was Hoa’s height? 5.What was Hoa’s weight? *Keys: 1. Hoa was doing the medical check-up 2. She took Hoa’s temperature, measured and weighed. 3. It was 37 0 C. 4. She was one meter 45 centimeters. 5. She was 40 kilos.

. Choose the best answer. 1. I ........................ born on the first of May. A. were B. was C. are D. is 2. The enemy (kẻ địch) ........................ by night. A. attack B. attacks C. attacked D. did attack 3. Mind about what I just ........................ now. A. said B. say C. did say D. didn’t say 4. Did you ever ........................ of such a thing? A. hear B. hears C. heard D. heart 5. He ........................ some eggs to make cakes. A. buys B. buy C. buied D. bought 6. There ......................any eggs in the packet when I ..................... the kitchen. A. was/ come B. were/ come C. was/ came D. were/ came 7. I ........................ a English course to improve all the skills. A. not joined B. joined C. did joined D. join 8. We ........................ to our friend last night. A. spoke B. speak C. speaked D. spoken 9. We ........................ and ........................ lunch at the cafeteria with them. A. talked/have B. talked/ had C. talk/had D. talked/ have 10. ........................ you attend yoga class when I ........................ at home? A. Did/ stayed B. Didn’t/ didn’t stayed C. Did/ didn’t stayed D. Did/ stayed