Mathematics is a variety of proof skills. Do sophomores learn math handwritten newspapers? The following are the pictures and materials of the second-grade math handwritten newspaper I brought to you. I hope you like it.

Appreciate the picture of the second-year math handwritten newspaper 1 the second-year math handwritten newspaper picture 2.

Picture 3 of the second-year math manuscript Picture 4 of the second-year math manuscript Picture 5

In ancient times, a prince went to the mountain to visit the son of martial arts. When the brothers saw his father coming, they immediately gathered around him. The prince said, "Children, your father brought your favorite pie today." Then he took out a pie, divided it into two parts and gave it to the boss. The second crooked his mouth and said, "My son." I want to eat two cakes. "So the monarch divided the second piece of cake into four parts and gave it to the second piece. The greedy third said, "Dad, give me three cakes. The monarch divided the third cake into six parts and handed it to him. The eldest brother, who has always been honest, said, "Dad, the fourth child is the youngest, and he should be given six dollars. The fourth is very happy and thinks he is a father.

The contents of the second-grade mathematics handwritten newspaper: 1, 2, 3, 4, 5, 6, 7, 8, 9 These nine numbers can be divided into three groups, each group has three numbers. Is the sum of each group equal?

Divide them into three groups to make the sum of each group equal, then the sum of each group should be 45÷3= 15.

Because each group must have three numbers, and the sum of the three numbers is 15, the numbers 7, 8 and 9 must be in different groups.

A group containing 9, the sum of the other two numbers is 6, so it can only be 2,4 or 1, 5.

If 9, 2 and 4 are in one group, then the sum of the other two numbers in the group containing 8 is 7, and only 1 and 6 can be arranged, and the remaining 7, 5 and 3 are in the third group.

If 9, 1 and 5 are in one group, then only 3 and 4 can be arranged in the group containing 8, and the remaining 7, 6 and 2 are in the third group.

So this topic * * * has two solutions:

9+4+2=8+6+ 1=7+5+3,

9+5+ 1=8+4+3=7+6+2。

It is easy to make each group contain three numbers. The key is to make the sum of each group equal. What should be the sum of three numbers in each group?

Calculate the sum of nine numbers first: 1+2+3+…+9=45.