There are three solutions to Sudoku. The first method is called unique numbering. Let's have a look at this table. You can see that there are three 4s and 1 in this row. If he is short of 2, we can make up 2. Then I will look at the order of 1 and 42 plus 3, so the following one can be filled with 3. What's the only number? There are no other figures to fill in, because.
The second method of solving problems is called row and column exclusion. Just now you saw my unique numerical method. Actually, I only read one line. How can I look at it comprehensively when I am in the column exclusion method? You can see that there are 2 and 4 in the row, and there are 1, 1 under it in this series. There are 2 and 4, and there are 3 gaps. Just fill in the position where they cross.
The third small method is called intrauterine exclusion. This method is not used very often, but it is very practical. For example, Sudoku in the fourth house must have 1234, and Sudoku in the sixth house must have 123456. Let's take this topic as an example. Does each of these four palaces make sense? Obviously, it's not that he is missing one in the lower left corner, is it? In the lower left corner, it should have a 1, and then by the same token, I can see if the other numbers 2 and 3 are missing. This is our intrauterine exclusion method.
Then please pay attention to your classmates. Does Sudoku's problem-solving skills mean that I must use the unique number method for this problem, and the rank exclusion method for that problem is not.
Please note that many methods of mathematics are complementary and can be used together. I hope you can use our problem-solving methods flexibly to make your problems easier and easier.