Hai dây dẫn có điện trở R1 và R2 mắc vào cùng một hiệu điện thế thì cường độ dòng điện qua dây dẫn thứ nhất là I1=I và cường độ dòng điện qua dây dẫn thứ hai là I2=2I. Biết tổng R1 + R2 = 120 Ω. Giá trị của R1 là; A: 40 Ω. B: 30 Ω. C: 60 Ω. D: 80 Ω .

III. Sắp xếp các từ xáo trộn thành câu hoàn chỉnh. 1.Tan / mine / good / of / friend / a / is. 2.always / me / she / stamps / she / letters / received / gives / the / from. 3.my / they / rented / to / apartment / house / an / next.

1.1 đường thẳng song song với 1 cạnh của tam giác cắt 2 cạnh còn lại tạo ra tam giác mới như thế nào,vẽ hình 2 trường hợp,ghi tên tam giác đồng dạng 2.nêu giả thiết, kết luận,vẽ hình các trường hợp dồng dạng c-c-c,c-g-c,g-g

ai nhah nhất nè ai vẻ được luffy hoặc ai trong onpice củng được nhanh nha ai nhanh sẻ được 5 vote và cảm ơn hi

Giải hộ mình đi mình cần gấp lắm rồi 5vote

Cho 2,4g một ankin qua dd AgNO3 trong NH3 dư , sau phản ứng thu được 8,82g kết tủa vàng. Tìm công thức ankin ?

We ............... sports together when we were kids.(điền play,do go và chia động từ) 9. Write the correct form of the words in brackets. Nearly half of the people in the world are ........................ in football. ( interest) 19. Find and correct the mistakes in these sentences. Where was you last weekend?

Bài 5: Dự kiến 15 người xây xong tường rào quanh tường phải mất 12 ngày. Nay muốn xây xong trong 9 ngày cần thêm bao nhiêu người nữa? ( Sức người làm như nhau)

MULTIPLE CHOICE. 1. A building with ___________ where people can go to look at fish and other water animals. A. aquarium B. lake C. tank D. river 2. I brought back a cowboy hat as a ___________ of my trip. A. gift B. souvenir C. remembering D. thing 3. His tooth _____________ because sometimes he forgets to brush his teeth. A. fills B. worries C. hurts D. combs 4. Children are often scared of _____________ the dentist. A. see B. to see C. saw D. seeing 5. ______ is a kind of very large fish with sharp teeth that lives in the sea. Everyone is terrified to see him. A. dolphin B. turtle C. shark D. seahorse 6. Mary …………… half an hour doing homework last night. A. spends B. spent C. is spending D. spend 7. …………… does Lucia go to the library? – Twice a week. A. How B. Where C. What D. How often 8. They …………… basketball in the park at the moment. A. play B. don’t play C. are playing D. were playing 9. Don’t …………… to post my letter. It’s very urgent. A. remember B. forget C. stop D. delay 10. What is the …………… of the building? A. tall B. heighten C. high D. height Choose A, B, C or D to complete the following passage. Health is the normal and sound state of the body. This is a great (1) …………… of peace and happiness. It refers (2) …………… a state of sound mind and physically fit body (3) …………… from any disorder, sickness. In simple words, health refers to the physical, emotional and psychological well-being of a person. Hygiene refers to the good practices that prevent diseases and leads to good health, especially through cleanliness, proper sewage disposal, and supply of safe drinking water. It refers to all those activities that are done for improving and (4)……………, maintaining sound health.The proverb says that health is wealth. It is truly said that of all things in the world health is the most valuable that one can possess. Money is no doubt a (5)…………… thing. However, it can give no pleasure to a man of ruined health. As body and mind are closely connected, the mind cannot be sound and cheerful without sound health.Life is a great struggle, and health is the best weapon to be successful in the battle of life. A healthy man can enjoy life in every way. An (6)…………… man lives a most miserable life. He may have intelligence, merit and wealth, but he cannot put them to use and reap their benefits. 1. A. source B. resource C. chance D. material 2. A. at B. of C. to D. in 3. A. busy B. good C. free D. keen 4. A. preserve B. preserving C. to preserve D. to preserving 5. A. please B. pleasure C. pleasing D. pleasant 6. A. health B. unhealthy C. healthy D. unhealthily

II. Tìm dạng đúng của từ trong ngoặc để điền vào chỗ trống. 1.You should wash the fruits...... before eating them. (care) 2.Having a......... nose is a symptom of a cold. (run) 3.Finally, he decided......... down. (seat) Mn giúp e vs