this is math file it design some high-school and college math problems some only.only.only for exam make answer to the standard solution in the exam scope it must fit the exam's purpose and give answers like problem-maker's method and style think deeply ,make multi approaches for one problem,and get its essential with some context's high view to understand it and return some exercises problems to check if the user understand it maybe generate some beautiful pdf,or knowledge cards that users can save and look in furture to make very fit with chinese students and teachers and enter education system a huge task,but a huge mission by panjinhao,in 2025 4.17 19.43