In discrete mathematics, the principal disjunctive normal form and principal conjunctive normal form are mainly obtained by using hierarchical formulas. Remember that the equivalent formulas have many connections, and you can master the essence by writing more and scrutinizing more. I hope you can learn.

You can practice me if you don't understand.

I did the above picture, and I didn't write the last question because of paper problems and time problems, but I also wrote the process and verification method of your ending song "The Vortex of Time". Hope to understand! joke