学习了有理数及其运算后,你知道这些知识在实际中的应用吗?现举例如下:一、正数和负数知识在实际中的应用例1某种商品的标准价格是每件400元,但随着季节的变化,该商品的价格可浮动±5%.请问若某商家将该商品的价格定为每件450元,他是否会受到物价部门的处罚?为什么?分析:要判断该商家是否会受到物价部门的处罚,应先确定这种商品 After learning rational numbers and their operations, do you know the application of these knowledge in practice? Here is an example: First, the application of positive and negative knowledge in practice Example 1 The standard price of a certain commodity is 400 yuan per piece, but As the seasons change, the price of the goods can fluctuate ± 5% .If a merchant set the price of the goods for each 450 yuan, will he be penalized by the price department? Why? Analysis: To determine whether the merchants Will be subject to price department punishment, you should first determine the goods