Use the eight numbers 2, 3, 4, 5, 6, 7, 8 and 9 to form two four digit numbers. How to make the product of the two numbers maximum? Pay attention to the analysis process. OK, add money

Use the eight numbers 2, 3, 4, 5, 6, 7, 8 and 9 to form two four digit numbers. How to make the product of the two numbers maximum? Pay attention to the analysis process. OK, add money

The smaller the difference, the larger the product, 9753-8642 = 1111, and 9876-5432 = 4444. It's very simple to see how to get the smallest difference. Subtract the nearest number from the largest 9, which is 8, and the difference is 1 (the smallest), and so on, which is 9-8 = 1, 7-6 = 1, 5-4 = 1, 3-2 = 1, so they form 9753 and 8642