Today, we have entered another kingdom. There is a lot of math knowledge here. But I have only learned a little knowledge about the characteristics of multiples of 3, which is more difficult for me. I thought anything related to 3 was a multiple of 3, but I was wrong about everything. Alas! How stupid of me! Slowly, I also learned a lot: originally, it is to add those numbers and divide them by 3, leaving no remainder is a multiple of 3.

Well, thanks to the help of teachers and classmates, otherwise I will be defeated by the king of mathematics! I believe I can be the queen (or king) of mathematics! Yahui's voice: well, I don't know if it's suitable, but you can think for yourself! If you can, can you be friends? My QQ: 1366826379