Analysis: Change 3 to 2.

Key points of knowledge about mobile competition;

1, composed of simple numbers and operation symbols with matchsticks;

2. Play variant games with "go", "add" and "move".

3. Mobile matchsticks can be added between numbers, or before or after numbers.

Extended data:

The related extension of mathematical application problems: the related function of mathematical application problems;

1, for students

Test students' mastery of mathematics and prescribe the right medicine.

2. For the field of mathematics

Can evolve into mathematical conjecture and mathematical theorem.

3. For other disciplines

You can turn physical and other scientific problems into mathematical problems and solve them mathematically.