Dãy các chất nào sau đây gồm tất cả các chất tác dụng được với oxi? A: Cu, Mg, S, Au. B: Mg, Al, S, P. C: H2 , P, Au, C. D: H2 , S, P, Pt.

tìm x thuộc Z, biết 2(x-5)-7(x+4)=2

x (x-y)(x+y)=... Cẩm ơn trc nha!

I. Rewrite the sentences so that they have the same meaning as the original ones. (1,0p) → Renewable energy ………………………….………………………………………..… 2. This is our school. → This school is ……………………………..………………………………………….… II. Rearrange the words to make meaningful sentences. (2,0ps) 1. Solar energy/ in the world/ by many countries/ will be used/. → …………………………………………………..………………………… 2. to another/ How/ you travel from / will/ one place/? → …………………………………………………..…………………………… 3. to save/ will reduce/ our energy/ the use of electricity/ We/. → …………………………………………………..………………………………… 4. traffic/ are/ rush-hours/ always/ There/ jams/ during. → …………………………………………………..………………………………… III. Use given questions and cues to make a topic for TRAFFIC: What should you do to have traffic safety? 1. What should you do to have traffic safety? There are some rules about road safety. It very important to obey these rules when you use the road. We should: 1. Always look carefully where you go 2. Use the pavement or footpath 3. Walk across the street at the zebra crossing 4. Wait for the traffic light to turn green before you cross the street. 5. Always fasten your seatbelt when you drive 6. Don’t drive if you feel tired or after you drink alcohol 7. Strictly obey traffic signals 8. Always wear a helmet when you ride a motorbike or electric bike 9. Give a signals before you turn left or right 10. Always keep both hand on the handle bar 2. When you are a road user, what should you NOT do? We shouldn’t talk and laugh loudly, look back, go in a red light... 3. Should one drive after drinking alcohol? Why or why not? No, he/ she shouldn’t. Because it is very dangerous. He/ she may cause an accident 4. Why should pedestrians wear light coloured clothes in the dark? - Because the other road users can see them clearly and avoid crashing into them. 5. How do you go to school every day? 6. How far is it from your house to school?

Tìm câu rút gọn có trong đoạn văn sau, cho biết thành phần đ¬ược rút gọn trong các câu đó? “ Đê vỡ rồi!... Đê vỡ rồi, thời ông cách cổ chúng mày, thời ông bỏ tù chúng mày! Có biết không? Lính đâu? Sao bay dám để cho nó chạy xồng xộc vào đây nh¬ư vậy? Không còn phép tắc gì nữa à?”

Các bạn giải giúp mik bài này với plzzz

III. Choose the correct option A, B, C or D to complete the sentences. (2,5ps) 1. ______ the traffic was bad, I arrived on time. A. Despite B. In spite of C. However D. Although 2. It takes me two hours___________ that letter. A. to write B. write C. writing D. for writing 3. I’m tired of _______ nothing to do at home. A. to have B. have C. having D. had 4. Please tell him to ______ the light. It is getting dark. A. turn on B. turn up C. turn over D. turn off 5. I am sure I locked the door. I clearly remember ______ it. A. to lock B. to have locked C. locking D. lock 6. We didn’t go out ______ it was raining. A. although B. because C. in spite of D. despite 7. An is a hard-working student. I think An___________ pass the exam easily. A. would B. has C. was D. will 8. In order to save energy, don’t forget to ______ the lights before you leave. A. turn B. turn on C. turn off D. turn of 9. The energy consumption__________ as much as possible. A. will reduced B. will be reduced C. be reduced D. reduced 10. My father ______ a lot last year but this year he doesn’t any more. A. used to smoke B. smokes C. gets used to smoke D. smoking I. Read the passage and tick () True or False. (1,5ps) Energy is one of the problems that many people are interested in. It is not an unfamiliar word. It is heard, said, discussed day after day. It is close to everyone’s daily life. You turn on a lamp and it is energy that gives you light. You turn on a TV and it is energy that gives you pictures and sound. You ride a motorcycle and it is energy that gives you movement. You cook your meals and it is energy that gives you heat to boil rice. The problem is that the demand for energy is rising and that the price of energy is getting higher and higher. The supply of energy on earth is limited. It cannot provide us forever. The shortage of energy in the future is inevitable. Therefore, saving energy is a must if we want to continue to live in a safe and sound world. * Notice: familiar: thân thuộc demand: nhu cầu inevitable: chắc chắn xảy ra Statements True False 1. Many people aren’t interested in the problems of energy. 2. The word “energy” is familiar and close to everyone’s daily life. 3. Energy is heard, said, discussed day after day. 4. We can’t watch TV without energy. 5. The supply of energy on earth is unlimited. It can provide us forever. 6. If we want to continue to live in a safe and sound world, we have to save energy. II. Read the passage again and answer the questions (1,0p) 1. How is the price of energy nowadays? →…………………………………………………………………………………………. 2. What should you do to save energy at home? →…………………………………………………………………………………………..

Một dây dẫn đồng chất, tiết diện đều có điện trở là 2 ôm. Gập đôi dây dẫn này để có 1 dây dẫn mới. Hãy tính điện trở của dân dẫn mới.

Bài 4: Tính tổng 1) 1 + (-2) + 3 + (-4) + . . . + 19 + (-20) 2) 1 – 2 + 3 – 4 + . . . + 99 – 100 3) 2 – 4 + 6 – 8 + . . . + 48 – 50 4) – 1 + 3 – 5 + 7 - . . . . + 97 – 99 5) 1 + 2 – 3 – 4 + ... + 97 + 98 – 99 - 100 Bài 14: Tìm x 1) x.(x + 7) = 0 2) (x + 12).(x-3) = 0 3) (-x + 5).(3 – x ) = 0 4) x.(2 + x).( 7 – x) = 0 5) (x - 1).(x +2).(-x -3) = 0 Bài 17: Viết dười dạng tích các tổng sau: 1) ab + ac 2) ab – ac + ad 3) ax – bx – cx + dx 4) a(b + c) – d(b + c) 5) ac – ad + bc – bd 6) ax + by + bx + ay Bài 18: Chứng tỏ 1) (a – b + c) – (a + c) = -b 2) (a + b) – (b – a) + c = 2a + c 3) - (a + b – c) + (a – b – c) = -2b 4) a(b + c) – a(b + d) = a(c – d) 5) a(b – c) + a(d + c) = a(b + d) Bài 19: Tìm a biết 1) a + b – c = 18 với b = 10 ; c = -9 2) 2a – 3b + c = 0 với b = -2 ; c = 4 3) 3a – b – 2c = 2 với b = 6 ; c = -1 4) 12 – a + b + 5c = -1 với b = -7 ; c = 5 5) 1 – 2b + c–3a = -9 với b = -3 ; c = -7 Bài 21: Hai ca nô cùng xuất phát từ A cùng đi về phía B hoặc C ( A nằm giữa B, C). Qui ước chiều hướng từ A về phía B là chiều dương, chiều hướng từ A về phía C là chiều âm.Hỏi nếu hai ca nô đi với vận tốc lần lượt là 10km)h và -12km)h thì sau 2 giờ hai ca nô cách nhau bao nhiêu km? Bài 23:

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