The biggest formula is big with small, small with big; The smallest formula is that the big belt is big and the small belt is small; If it is odd, you can borrow 0. The law of maximum product is: the higher the ranking of large numbers, the better, and the smaller the difference between two digits, the better. The law of minimum product is: the more decimal places, the better, and the greater the difference between two digits, the better. Product product is the name of many different concepts in mathematics. In arithmetic, the result of multiplication of two or more numbers is called their product or product.

The principle of un method to find the minimum and maximum product is the minimum sum of products, which means that for two variables, the sum is a fixed value, the product has a maximum value, the product is a fixed value, and the sum has a minimum value.

The minimum sum of products and the maximum sum of products mean that for two variables, the sum is a fixed value, the product has a maximum value, the product is a fixed value, and the sum has a minimum value. The math propaganda is as follows: So (a+b)? ≥4ab .