Your complete topic should be the same as that on the Internet: 45 students from Class 2, Grade 3 donated RMB * * * to the Love Foundation, of which 1 1 each student donated RMB 1, and other students donated 2 yuan and 5 yuan each. How many students asked for 2 yuan and 5 yuan respectively? It should be this problem, binary linear equation. As long as one of them is X and the other is Y, this simple problem cannot be deduced. Suppose x people donate two yuan and y people donate three yuan. Equation (1) x+y+11= 45 (2) 2x+5y+1= Solve the equation, multiply both sides of (1) by 2 at the same time and then subtract (65438) from Equation (2). Let me tell you a secret. The simpler the topic, the less you can guarantee that it is all right, so you can't jump and write, try to write in detail. And the more difficult the topic is, skip it if you can. After all, if you write too many big questions, you will often get a little point. Sometimes, if one is yes or exists, there will be 1 point, and those you write, the most you can do is to review it, and give it 1 point 2 points, which is the case in junior high school. (ps: Xueba, please go away)