Tìm số có ba chữ số biết rằng nếu viết thêm chữ số 7 vào trước số đó, ta được số mới gấp 6 lần số ban đầu

Câu 1:Thực hiện chuỗi phản ứng sau: (1) (2) (3) CaCO3 → CaO → Ca(OH)2 → Ca(NO3)2

Cho 50 ml dung dịch HNO3 1M vào 100 ml dung dịch KOH nồng độ x mol/l, sau phản ứng thu được dung dịch chỉ chứa một chất tan duy nhất. Giá trị của X là gì các bạn giúp mình với <3

Giúp em b12b ạ lát nữa e nộp r ạ

Bài 1: Phân tích đa thức thành nhân tử a) 14^2y - 21xy^2 + 28x^2y^2 b) x^2 - y^2 - 2y - 1 c) x^2 + 4x - 2xy - 4y + y^2 giúp em bài này với ạ mong mng giúp ạ

Các bạn làm giúp mình được không

Mn giúp em với ạ em cảm ơn 🥰🥰

The world's best-known inventions of the Vietnamese The father of ATM (automatic teller machine) is Do Duc Cuong, who has made 50 inventions. He was found as the student with the highest (16) index in a test carried out by a Japanese group of scientists. This gave him the (17) to receive a scholarship to follow the university study at Osaka University. In Japan, Mr. Cuong went to university and took an extra job for Toshiba Company. An invention then unexpectedly brought him to the US. Mr. Cuong was then invited to the US to “use a technique to obtain one billion clients for the bank”. Mr. Cuong said his work is to popularize banking (18) , so as to make the services accessible to everyone. He has invented the ATM, which is considered a (19) in the banking history. Professor Dr. Nguyen Viet Hung, a Vietnamese native who now works at the Sydney University in Australia, and his associates successfully generated a smart wheelchair. The wheelchair is designed to have the function of a moving (20) which can avoid obstacles which it sees through the camera (21) on the vehicle. The wheelchair can move based on people’s commands, cither the shake of the head, eyes, and the (22) of the owners. Professor Hung believes that the invention would create a big (23) for the human’s research works to help make the lives more convenient for paralytic people. Dr. Chu Hoang Long was the only Vietnamese (24) who received Eureka prize for the water research and innovation. The model allows fanners to find out the optimal volume of water needed for watering, and the optimal (25) of water needed for protecting the environment, while helping create the flows beneficial to the environment. revolution opportunity volume co-inventor services robot installed breakthrough thoughts intelligence

Làm tính chia: a) (2x^5 – 5x^3 +x^2 +3x-1):(x^2-1)

Kho A có ít hơn kho B 120 tấn thóc . Tính số thóc mỗi kho .. Biết rằng kho A bằng 2-5 số thóc ở kho B