Four quick questions(four underlined sections) : What does the multiplication sign in
① mean? Or what does the whole underlined part(1) mean? The encryption and decryption in
② are not reciprocal, and the encryption should be reciprocal with the handwriting on the right of decryption in the above picture, right? What is the meaning of gcd in
③? Why is there no mod in the left-hand 6(x+13)+1 in
④?
0 Answer
No answer yet
这家伙很懒，什么都没留下...