Li Bai walked in the street doing nothing, carrying a pot to buy wine. When he met a shop, he doubled it. When he saw flowers, he drank a bucket and drank all the wine in the pot three times. How much wine is there in the pot? Li Bai drinks a pot, doubles it when he meets a shop, and drinks a bucket when he meets flowers. How many barrels of wine are there in the three flower shops?

In the question, the original amount of alcohol in the pot is required, and the change and final result of the wine in the pot are told-three times (times 2) quantitative reduction (weight reduction barrel) and light. To solve this problem, it is generally based on the changed results, using the reciprocal relationship of multiplication and division, addition and subtraction, and gradually reverse reduction. "Drink all the wine in the pot after meeting the flowers in the store for three times" means that there is a bar barrel in the pot after meeting the flowers in the store for three times, a bar barrel after meeting the flowers in the store for three times 1÷2, and then a bar barrel after meeting the flowers in the store for two times 1÷2+ 1.

[(1÷ 2+1) ÷ 2+1] ÷ 2 = 7/8 (barrel)

So, the pot hit 7/8.

The key point of the above solution lies in inverse reduction, which can also be expressed by schematic diagram or line segment diagram.

Of course, if we use algebra to solve this problem, the quantitative relationship will be more clear. There are x barrels of wine in the pot. List the equations according to the meaning of the question.

2[2(2x- 1)- 1]- 1 = 0

X=7/8 (barrel) is obtained by solving.