你知道四则混合运算指的是哪四则

简介：As he mastered the knowledge of swordsmanship, his understanding of swordsmanship became stronger and stronger. Just like a top student, when he first started to learn something, he still needed to study it. Once he had completely mastered this kind of thing, So as long as there are similar things, you will understand them by analogy and you will understand them at a glance.