I thought this problem could be analyzed in this way. First of all, the value of y can be calculated according to known conditions, which means that y is also a constant value. And the given Y0 is also a constant value. The relationship between the fixed values y and Y0 here is: y is greater than Y0, y is equal to Y0, and y is less than Y0. Because the topic requires us to find the minimum value of the absolute value of Y0-Y, it is obvious that the absolute value of Y0-Y is greater than 0 whether Y is greater than Y0 or Y is less than Y0. But the minimum value of the absolute value of Y0-Y can only be obtained when y is equal to Y0, so the minimum value of the absolute value of Y0-Y is 0.

According to your supplement, it means that the relationship between A 1n 1 is a product relationship. But whether the value of y is a fixed value or not, the result between y and Y0 is nothing more than the first three cases, which are either greater than, less than or equal to, and nothing else, right? Therefore, the minimum difference between two numbers can only be 0. To put it bluntly, the minimum value of an absolute value can only be 0, and everything else can be ignored. In fact, the ultimate goal of this topic is to test your judgment on the minimum absolute value. I think you understand.