2. The mathematical problem with a history of more than 2,000 years is that regular heptagons can only be drawn with compasses and rulers, and there is no scale. From working harder and harder, racking our brains and making no progress, we can realize that this problem is very difficult. From awakening ... fighting spirit, trying, being unconventional and so on, we can realize that Gauss, the prince of mathematics, is obsessed with mathematics, and will not stop until he solves the problem.

3. Corresponding sentences: The young man is very talented in mathematics, and his tutor places high hopes on him and gives him two difficult math problems every day.

5. The essay is entitled "One Night in 2000" because: This topic can not only arouse readers' interest in thinking and desire to read, but also make a sharp contrast between them, which further highlights Gauss's mathematical talent and greatness.

This is the answer according to my question. I wonder if I can help you. Come on ~