For example, I mean, for example. This batch of books *** 15. Do you know this? We take the least common multiple of 5,15,3). So there are three books about technology. 1 This serial. 10 children's literature. Needless to say, the remaining 1 is what we call others.

Now answer the question: 1, science books and comics =3+ 1=4 = 15, which is 4/ 15 (you take it as a fractional line).

2. Children's literature books are more than science and technology books = 10-3=7, accounting for 15, that is, 7/ 15 (ibid.).

For example, the practice of textbooks: 1,1/5+115 = 4/15.

2,2/3-1/5 = 7/15 (I don't know)