=9÷3×8

=3×8

=24

Extended data

Think about solving problems:

1, try to find a balance number when doing 24 o'clock. According to the multiplication formula, 24 can be decomposed into 2× 12, 3×8 and 4×6, so it will be easier to find a way to add these values to the known numbers.

2. Take the topic as an example. There is a number 8 in a given arithmetic progression. Then, according to the decomposition and multiplication formula mentioned above, we should figure out how to make 7,9, 10 become 3 through operation.

3. 9 ÷ 3 = 3, 10-7 = 3 is known. By integrating these two formulas, we can get what we need. Finally, 3×8 is used to get 24.