(2) According to the significance of fractional subtraction, popular science books account for [2/5]-[ 1/3] more than story books.
( 1)[ 1/3]+[2/5]=[ 1 1/ 15].
A: Two kinds of books * * * account for [1115] of the total.
(2)[2/5]-[ 1/3]=[ 1/ 15].
Answer: There are more popular science books than story books [115].
Comments:
The test center of this topic: the application problem of score addition and subtraction.
Test center comments: This is a basic simple application problem, with small amount and simple equivalence relation, which can be solved in one step.