Which ancient primary school poem contains mathematical knowledge?

Looking at the seventh floor of the towering tower from a distance,

Double the red light;

* * * three hundred and eighty-one,

How many tips are there at the tip?

The prompt is 192 light.

The analysis is as follows:

Jason Wu's "Nine Chapters of Arithmetic Bixing" contains the following "Mathematical Poems": "Looking at the towering tower in the distance, the red dots are doubled. * * * There are 381 lights. How many lights are sharp? " This poem is like an "algebra application problem". Think a little and you will get the answer. Because the number of lights on the first floor to the seventh floor is multiple, if the number of lights on the first floor is "X", then the number of lights on the second floor to the seventh floor is 2 times, 4 times, 8 times, 16 times, 32 times and 64 times that of the first floor, and the number of lights on the first floor to the seventh floor is 128. So you can calculate that the number of lights on the first floor is 3. 3× 64 = 192, that is, the spire (seventh floor) is 192 lamp. Although this poem is a "mathematical poem", it is still a masterpiece because of its concrete image and easy to understand.