Current location - Training Enrollment Network - Mathematics courses - The second grade problem of primary school mathematics
The second grade problem of primary school mathematics
I was confused when I looked at the topic. It turns out that I understand whether it is a Shen-shaped shape.

A

BCD

Edge-limited feed film growth

HIJ

K

In this case, the first step: the second, third and fourth lines add up to 18, and the total is 18*3=54.

Step 2: Then the sum of the numbers of 1 1 is 66. Step 3: That is, A+K=66-54= 12.

Step 4: The sum of each column is 18, that is, A+C+F+I+K= 18. Step 5: C+F+I=6.

Step 6: C, F and K are 1, 2 and 3 respectively. Part 7: Obviously A and K are 4, 8 or 5, 7.

However, the correct result cannot be calculated later, because there are still three numbers, 8, 9, 10, which should be completely separated in the rank, so that the sum of each rank will not be greater than 18, but the number in the middle column has been decided, so it can only be divided into two columns, so the sum of one column must be greater than 18.

But I want to say, I suggest you follow the order from the first step to the seventh step, and then you can get the main line of this diagram, and then divide the remaining three largest numbers into different ranks, and the other numbers can be tried several times. Its principle should be the same as the following array.

294

753

6 18

The sum of horizontal and vertical directions is equal to 15. In fact, it is to put the average in the middle, put the three largest numbers in different rows and columns, and then try several times. Oil; Fuel charging; Make greater efforts