If there are many knowledge points in a question, and there are hidden conditions, it is necessary to use formula derivation or calculation to make the correct answer. The difficulty of such questions is medium.
If there are more knowledge points in a question and there are implicit conditions, it is medium to use formula derivation or calculation to make the correct answer.
If there are many knowledge points in a question and there are implicit conditions, it is necessary to use formula derivation or calculation to make a correct answer, and the difficulty of such questions is medium.<br>