Stationery stores, bookstores and toy stores are located in an east-west street. The stationery store is 20 meters west of the bookstore, and the toy store is located in the east of the bookstore.

Stationery store, bookstore and toy store are located in an east-west street in turn. The stationery store is 20 meters west of the bookstore, and the toy store is 20 meters east of the bookstore 100. Xiaoming walks 40 meters east from the bookstore, and then walks -60 meters east. At this time, Xiao Ming's position is ().

A. Stationer B. Toy store C. Stationer 40 meters west D. Toy store East -60 meters test center: positive and negative; Addition of rational numbers.

Special topic: computational problems; Application problem.

Analysis: firstly, investigate the meaning of the problem and make clear the meanings of "affirmation" and "negation"; Go east-60 meters means 60 meters west, and then answer the question according to the meaning.

Solution: Going east -60 meters means going west 60 meters. So Xiaoming walked 40 meters east from the bookstore and then 60 meters west. As a result, Xiao Ming's location is 20 meters west of the bookstore, which is the location of the stationery store, so he chose A.

Comments: The key to solve this problem is to understand the relativity of "positive" and "negative" and to make clear what a pair of quantities with opposite meanings are. In a pair of quantities with opposite meanings, one of them is defined as positive and the other is negative.