The Complete Interpretation of Textbooks is a synchronous teaching aid in Wang Houxiong's teaching aid series, that is to say, it has a one-to-one correspondence with the curriculum of textbooks. But the textbooks used in different places are different, so apart from grades and subjects, what versions are there, and the cover is marked with pinyin abbreviations!

As far as I know, compulsory math 4 is divided into version A, version B, version Soviet Education and version Beijing Normal University, so I don't know which version of the answer you want! Post personal version A first, please check it, it is the most widely used.

(1) Click to see a larger image. I was told that the picture was not clear, and I was drunk!

(2) After use, please adopt it? ! More and more people, after being answered by others, leave it alone, which is a great blow to their enthusiasm. In particular, it is very troublesome to upload typesetting documents into pictures. Please respect the fruits of others' labor. Thank you!