cho e hỏi cách tính đường cao trong tam giác vuông với ạ

Cho tam giác ABC, M là trung điểm của BC. Trên tia đối của của tia MA lấy điểm E sao cho ME = MA. Chứng minh rằng: a) AC = EB và AC // BE b) Gọi I là một điểm trên AC ; K là một điểm trên EB sao cho AI = EK . Chứng minh ba điểm I , M , K thẳng hàng c) Từ E kẻ EH ⊥ BC. Biết ∧HBE = $50^{o}$ ; ∧MEB = $25^{o}$ . Tính ∧HEB và ∧BME

Tinh A=x ³-30x ²-31x+1 tại x=31 B=x^5-15x^4+16x^3-29x^2+13x tại x=14 C=x^14-10x^13+10x^12-10x^11+...+10x^2-10x+10 tai x=9

4/5 của 20 là......... 2/3 của 180 là....... 7/6 của 30 là.......

2 ngày 7 giờ × 6 =mấy vậy huhu mai thi rồi

niềm hoài cổ trong nhớ rừng và ông đồ cho mik xin mở bài vs lại 2 bài đs cần chứng minh khổ thơ nào là thích hợp và xin luận điểm luôn nhó cám ơn

Mọi người check lỗi ngữ pháp hộ em với ạ! Mọi người check lỗi ngữ pháp hộ em với ạ! Means of transport is the most important part of the life. If we don't have means of transport we won't be able to improve like we are now. Today, the means of transport is very modern and convinience. But it have many problems. So now I will introdunce about a new transport in the future. Now I will talk about my dream means of transport called FMC. That is the name I called it it is stand for Flying Morden Car. In my opinion, it will powered by solar energy. It will have a solar panel in its top. Solar energy will open air conditioner. That air conditioner can heat up air inside a car but it also can freeze air when it is hot outside. You can control all air conditioner just for your voice. You can command for air conditioner by just say "Turn on air conditioner" or " Change temparature to 21,87 Celsius". That air conditioner can change to many scale like Celsius, Farrenheit,… Inside car control, you can see a small screen. You can play music by that. It can play music very well. It can play classical music, rock, rap, … It can remember what type of music , what song , what singer do you like by using Artificial Intelligent. And it can l suggest many song by using your favourite hobbit. Also you can call to your family and take some photos with you and passengers. Recording video is one of its ability. When you go near your favourite restaurant you can order it and you can take it when you go in it. But the most important is driving this car is very very easy. You can be able to drive this car for 1 hour . It will have a auto drive system. So you will be free when you drive a car. You can be able to learn or work in car when the car is boarding. It can talk to you about what road is traffic jams or what road mostly have accident to avoid. But in facts, you won't need to worry about traffic jams because it is flying car. That means you can drive it as a plane. You won't need to waiting for many hours for waiting traffic jams. You can drive in a sky won't need to drive at ground. But many people will have a question :" Wait ! If the car is in a sky , the car will crash. " But no, they will have SSS – Sky Safe System. In each city there are eight to twelve tower working as air traffic control system. They will see throught drone to see what car is running too high speed and they will control drones stop that car and punish driver. Actually, speed that called too high speed in the future is very fast from 200 kmp per hour and more. Because now FMC – a new car in the future can go in very fast speed approx 150 kmp per hour. So how can it go to that speed ? In ground, it will use ion engine. That engine works by accelerating ions using electricity to create thruster. That thruster will force car to go. Using ion engine can help it go fast without noise and pollution because the engine just need ions to work. It is very fast and it can give you to far city just a moment. Ion engine is really strong and it also is stable. Ion engine won't like the engine now it is seldom break down and it can stand for many accident. If you have accident, you won't need to worry about engine. If your engine is broken, you can call to drone to fix it. You can command for drone to fix your engine and you can see it in screen to know what part of your engine is broken. When you want to fly, the wheel will disappear and rockets unside the car will appear. But the most important is these rockets can move smoothly. So you can move really easy. It can fly very well so you can go to airport very simple. The bad weather isn't a thing that you need to worry. The energy what make by converting sun shine to energy is infinity despite rain. The screen that you see to drive can remove water to you see easily. So you won't have accident. The coolest thing is it have six seats so your friend or family can drive also. That is my dream means of transport in the future. But in my mind now we can make it but in future I think they will be able to make it. How about you ? Tell my about your dream means of transport in the future? It is car, motorbike or train? See you soon in my next paragraph

2 years ago,very ..... people in my village had cars or motorbikes (chỗ trống có 3 từ nha,giúp mik vs ạ )

bài 23: nêu sự ra đời của chữ Quốc Ngữ

Bằng những sự kiện lịch sử đã chọn lọc chứng minh nước việt nam dân chủ cộng hoà sau khi thành lập đã rơi vào tình thế ngàn cân treo sợi tóc