Hashed passwords (our passwords are not encrypted) cannot be decrypted. They do not have an inverse operation (unless there were known vulnerabilities with the hash function / algorithms) and they are used specifically to make this hard (as in nearly impossible).
This is intended and done for security purposes, if a database with hashed passwords is compromised, the passwords would not be known (it would still be a good idea changing the passwords as there are other attacks that come into play, but this is generally out of scope of this discussion).