Help vs ạ :L tối nay phải nộp cho cô r :D

Cho hình chữ nhật ABCD có AD = 6cm ; AB = 8cm . Hai đường chéo AC và BD cắt nhau tại O . Qua D kẻ đường thẳng d vuông góc với BD, d cắt BC tại E a) CM tam giác BDE đồng dạng với tam giác DCE b) Kẻ CH vuông góc với DE tại H . CM DC bình phương = CH.DB c) Gọi K là giao điểm của OE và HC . Chứng minh K là trung điểm của HC . Tính tỉ số giữa diện tích tam giác EHC và diện tích tam giác EDB ( Ai học giỏi Toán hình lớp 8 thì giúp mình với nha , nhanh nhất thì tui tick hay nhất + 5 sao )

Cho A = 2/x+3 với x khác 0, x khác 3 a)Tìm x để A <1 b)Tìm x để A >1

1. Hoàn thành những phản ứng hóa học sau : a) . . . + . . . MgO b) . . . + . . . P2O5 c) . . . + . . . Al2O3 e) H2O . . . + . . . f) KClO3 . . . + . . . g) KMnO4 K2MnO4 + MnO2 + . . . h) Mg + HCl MgCl2 + . . . i) Al + H2SO4 Al2(SO4)3 + . . .

Viết mở bài tả cảnh 1 đêm trăng đẹp - sáng vằng vặc 1. Có câu thơ hay 2. Tầm 6 - > 7 dòng

bạn ơi có thể giú dc ko Cities look fantastic ___(1)___night. In the evening, the sun goes ___(2)___. The sky gets ___(3)___and darker. Slowly the bright colours go, ___(4)___. Everything looks grey. Then the lights come on. The buildings look beautiful. Cities look ___(5)___at night. 1. A. at B. in C. on 2. A. up B. through C. down 3. A. brighter B. darker C. blacker 4. A. too B. to C. and 5. A. same B. different C. ugly II. Choose the correct answer A, B, C, or D for each of the gaps to complete the following text. I always wish to have a motor home in my life. My motor home will not need to be big, but it might have everything I need inside. There will be a small sofa and a lovely table in the head of the car. This will be the place for my friends when they visit me. It is like a living room. The biggest part of my motor home will be my kitchen. It will be in the middle of the car. There will be an automatic dishwasher, a modern fridge, a small oven and an automatic washing machine in the kitchen. A small toilet will be in the kitchen, too. The last part will be my bedroom, also my entertainment place. There will be a small bed, a wireless TV, and a high-tech computer. Everything might be small in my motor home. It would be fantastic if I had my own motor home. The best thing about having a motor home is that I can drive it myself and travel around. 1. What kind of house does the writer wish to have? A. A space houseboat B. An auto house C. A motor home 2. How many parts are there in the house? A. 2 B. 3 C. 4 3. What is NOT true about this house? A. It will not be very big. B. It has everything that the writer needs inside. C. The writer will have to do the laundry by hand. 4. Why does the writer love this kind of house? A. Because the house is big B. Because he can invite friends to his house. C. Because he can travel around with his house. 5. What is the biggest part of the house? A. The living room B. The kitchen C. The bedroom III. Read about Da Nang City and answer the questions. A robot cannot think or do things alone. People use a computer to control it. Today, robots are not very popular because they are too expensive, but they are very useful. They can help us save a lot of time and work. A robot can do the same work for 24 hours and it does not complain or get tired. In the future, scientists will design many types of intelligent robots. Their robots will be able to do many more complicated things. However, some people do not like robots. They fear that one day robots will be too powerful. 1. Why do people use a computer to control a robot? → People use a computer to control it. …………………………………………………………………………… 2. What can a robot help us? → …… They can help us save a lot of time and work ………………………………………………………………………………………… 3. Are robots cheap or expensive? → Yes there are ……………………………………………………………………………………………… 4. Do all people like robots? → …………………………………………………………………………………………….. D. WRITING I. Finish the second sentence in such a way that it has the same meaning as the first one. 1. Phong was sleepy, but he still stayed up late to watch the end of the game on TV. (although) ………………………………………….………………………………………………… 2. Our resources of energy will soon end because we don’t try to save it. (if) ………………………………………….………………………………………………… 4. No cities in Viet Nam are more crowded than Ho Chi Minh City. (most) ………………………………………….………………………………………………… 5. Robert is ill. I will come to see him. (if) ………………………………………….………………………………………………… 6. I will probably move to live in Manchester next year. (might) ………………………………………….………………………………………………… 10. We will start at six. We will arrive there before noon. (if) …………………………………………………………………………………………… 11. The boy eats so may green apples. He will be ill. (if) …………………………………………………………………………………………… 12. We will use reusable bags for shopping. We will reduce waste. (if) ……………………………………………………………………………………………

Một lớp học có 40 học sinh. Số học sinh trai bằng 3/5 số học sinh gái. Hỏi lớp đó có bao nhiêu học sinh gái?

Vẽ thủy thủ mặt trăng đẹp, đẹp, đẹp đẹp mà ko cần đẹp lắm âu

cứu mị đừng báo cáo nhé đa2g lại .Mệt

d.(-3).7-4.(-5)+1 e.125-4.[3-7.(-2)] f.221+4.[(-5).8-4]