Li Bai was walking in the street, carrying a pot to buy wine.

When you meet a shop, look through it and see the flowers and wine.

I met the shop flower three times and drank all the wine in the pot.

Please guess, there is wine in the pot.

Solution 1: Equation:

Suppose: there is X bucket of wine in the pot.

The wine in the pot is 2x- 1 flower after shopping;

The wine in the pot is 2 (2x-1)-1;

The wine in the pot is 2 [2 (2x-1)-1]-1;

So it is related: 2 [2 (2x-1)-1]-1= 0;

Solution: x = 7/8;

Solution 2: Arithmetic method:

Through backward reasoning:

Before meeting flowers and after drinking: 0+1=1;

Finally, if the number of shop visits doubles, the original text:1÷ 2 =1/2;

Hua Er will have a drink later. Original text:1/2+1= 3/2;

Double the second visit to the store, then the original: 3/2 ÷ 2 = 3/4;

Have a drink when you meet flowers for the first time. Original: 3/4+1= 7/4;

The first time I arrived at the store, I doubled it. It turned out that 7/4÷2=7/8.

Combine the above 7/8 barrels.

A: The original wine is 7/8 bushels.