The word "solution" is to be written, which is the format for solving problems. Mathematical application problems don't need to write solutions, but when solving equations, you must write solutions. This is the format of solving problems in eighth grade mathematics. The application of eighth grade mathematics solution is completed by equations, so when solving equations, you must write this application problem, and some comprehensive problems in junior high school and senior high school need to be written. Write the word "solution" first, then list the formula, then calculate, and finally write the answer.