Ba đội máy cày, cày trên ba cánh đồng có cùng diện tích. Đội thứ nhất cày xong trong 4 ngày, đội thứ hai cày xong trong 6 ngày, đội thứ ba cày xong trong 5 ngày. Hỏi mỗi đội có bao nhiêu máy cày? Biết tổng số máy cuả đội thứ nhất và đội thứ hai nhiều hơn hai lần số máy của đội thứ ba là 1 máy và năng suất của các máy như nhau.

Các câu hỏi liên quan

đọc và trả lời câu hỏi, m cần gấp ai nhanh nhất m cho câu trl hay nhất Luka Horvat writes about his early career My dad was a professional basketball player in Germany, and I went to watch many of his games when I was a kid. I loved telling my friends how good my dad was, of course especially when he won a game, but I used to take a book with me to read instead of watching. Starting secondary school, I was still two years away from being a teenager but was already two meters tall. Seeing my height, my sports teacher asked if I'd be interested in training with the basketball team. I thought I'd need to develop my skills before I took part in a real match, but the teacher had more confidence in me than I did. It took me a while to agree, but a few weeks later I found myself playing against a team from another school. Mum and Dad coming to watch didn't really help--it made me more nervous. But it was OK in the end! For the next four years, I practised every day and did really well, even joining an adult team before I moved abroad to a special sports academy in the USA when I was fifteen. The coach there trains Olympic basketball players, and it was fantastic to work with him. However, I can't say I enjoyed my first experience of living far from my parents. Life wasn't such a change for me because I was as busy as before, never being able to spend much time with my friends because of all the training. I got used to everything about my new life in the end, though, and my English improved quickly too! I turned professional at the age of eighteen - three years after arriving in the USA. I'd been taller than most players in the professional league since I was fifteen, but I was too light for my height, so I had to get heavier first. My coach already knew a team that would take me while I was still at college, so I joined them and I have never regretted it.