I suppose your grade is still very young? You may not understand what I say below. . I think what you want to ask is Chen Jingrun's proof (1+2)? In fact, I have fallen into this misunderstanding before. It is said that Chen Jingrun proved it (1+2) but no one can prove it yet (1+ 1). Always curious. . 1+ 1 = 2 is not known in our primary schools? How to use it without evidence? 1+ 1 = 2 is not the same proof method as 1+2 = 3? Chen Jingrun proved the problems related to Goldbach's conjecture. Goldbach conjecture was put forward by a mathematician named Goldbach, which probably means that any even number greater than 2 can be decomposed into the sum of two prime numbers. For example, 8 = 3+5,26 = 1 9+5 ... prime numbers mean that this number can only be divided by1and itself. Such as 7, 1 1, 19. Now this proposition has not been proved. But through the high-speed operation of the computer, people can calculate this proposition until very large numbers are correct. It should be right. A long time ago, foreigners proved that any even number greater than x (x should not be very large) can be decomposed into the sum of the products of one prime number and seven prime numbers. People express this as (1+7). Later, it was proved that a big even number can be decomposed into the sum of the products of a prime number and six prime numbers (1+6). The sum of the products of one prime number and five prime numbers (1+5). Later, Chen Jingrun in China proved that any big even number can be decomposed into the sum of the products of a prime number and two prime numbers, which is what people have long said (1+2). For example,18 = 3 (3 * 5); 30=5+(5*5)。 As for how he proved it, it's all a big book. The average person can't understand it. Including you and me now. . But people have not directly proved Goldbach's conjecture, that is, (1+ 1). This is what people often say can be proved (1+2), but it cannot be proved (1+ 1). Not that we can prove that 1+2 = 3, nor can we prove that 1+ 1 = 2. In fact, 1+ 1 = 2, 1+2 = 3 are axioms and criteria stipulated by people, and neither proof nor proof is needed. Are you clear?