A math problem: calculate 24 points The geniuses use 12, 12, 31 to calculate 24 o'clock

A math problem: calculate 24 points The geniuses use 12, 12, 31 to calculate 24 o'clock

There is only one way to make 24
1 24
2 12
3 8
4 6
I don't know how to calculate it. I'll think about it again. I'll let you know if I come up with it, but I think it's better for you to use your brain again