Trong không gian , hình chiếu vuông góc của điểm M2;−2;1 trên mặt phẳng Oxy có tọa độ là

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Cho hàm số . Hàm số có:

• Treo vật có khối lượng 300 g vào một lò xo thẳng đứng có độ dài 25 cm. Biết lò xo có độ cứng 100 N/m, gia tốc trọng trường g = 10 m/s2. Chiều dài của lò xo khi vật đứng cân bằng là  

• Jake recommended that Susan ______ immediately.

• Thời kì Bắc thuộc Nho giáo có ảnh hưởng như thế nào đối với nước ta?
  

• Cho thỏa mãn phương trình . Tính         

   

            

• He ______ us for hours with his stories and jokes.

• Cừu được nuôi chủ yếu ở

• Cho m gam Na vào 200 ml dung dịch hỗn hợp NaOH 1M và Ba(OH)₂ 0,5M, đến phản ứng hoàn toàn thu được dung dịch X. Cho dung dịch X vào 200 ml dung dịch hỗn hợp Al₂(SO₄)₃ 0,5M và HCl 1M, đến phản ứng hoàn toàn thu được 31,1 gam kết tủa. Giá trị lớn nhất của m là:

• Có học sinh lớp ; học sinh lớp ; học sinh lớp . Chọn ngẫu nhiên học sinh lập thành một đội. Tính xác suất để tất cả học sinh lớp đều được chọn?

• Read the passage and choose the correct answer:
  Las Vegas, Nevada, is the most famous city for gambling in the United States. Some people say that Las Vegas is a mispronunciation of 'lost wages'. The casinos and hotels have so many neon lights that people call this city in the desert 'The City of Lights'.
  Each of the big hotels in Las Vegas is special. Going into one is like entering another world. One hotel is like ancient Egypt. Another is like a tropical island. Still another is like New York City. These hotels have shows with famous entertainers. Everything looks expensive. But the rooms cost half the price of the rooms in other places. And the restaurants have all-you-can-eat meals for very little money. That's because the hotels make their money from the gambling casinos.
  Las Vegas started in 1905 as a small train stop. There. were only a few buildings in the middle of the desert. In 1946. a famous gangster named Bugsy Seigel built the first casino. He was murdered in 1947. "Iris made him and Las Vegas more famous! In the early 1950s, tourist went to Las Vegas not only to gamble. They went to watch atomic bomb tests in the desert outside the city. In those days, people didn't know it was dangerous. They thought it was exciting.
  Las Vegas is also famous for its many wedding chapels. Like all of Las Vegas, they are open twenty-four hours a day. Getting married is easy. A couple just pays a few dollars for a license, and they can get married immediately. They don't have to wait. Many famous movie stars were married in Las Vegas.
  It is interesting that Las Vegas has more churches for its population anywhere else in the United States. That's not counting welding chapels. Another interesting fact is that tourists have a greater chance of having a heart attack in Las Vegas than in any other American city.
  Question. Las Vegas is also the place. . . . . . . . . . . . . . . .