There are four books left in math.

There is something wrong with the topic!

Analysis: Suppose Xiao Fang has 1 book, then after I gave her 9 books, Xiao Fang now has 1+9= 10 book; At this time, I only have 13-9=4 books, so we can't have that many books. Because according to the meaning of the title, I actually have 9+9= 18 more books than Xiao Fang. According to the known information, I only have 13 books, which is absolutely impossible.

Mathematical sophomore elliptic hyperbola. Thank you.

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