It is right to write the answers to big math questions first. Big questions are generally solutions or questions, and some are proof questions. Now the proof question is also written in one word. It used to be proved in two words, but now it is written in one word "solution".

If it is a regular exam, for example, a word solution has been printed on the answer sheet of the senior high school entrance examination, then you don't have to write a word solution to solve the big problem. If you want to read it clearly, you don't have to write it again.