Interpretation and analysis: In this formula, the number that appears is "1, 5,5,6" required in the title. If you first calculate (5- 1÷5) in brackets, you get 4.8, and then multiply it by 5 to get 24.

Thinking of solving problems: 3×8=24, 4×6=24, 12×2=24.

Try to add the four numbers on the card face to 3 and 8, 4 and 6, and then multiply them. For example, 3,3,6, 10 can form (10-6÷3)×3=24, for example, 2,3,3,7 can form (7+3-2 )× and so on.

Extended data:

Specific gameplay at 24 o'clock:

The specific play of blackjack is: take a deck of cards, take out the queen and queen (you can also take J/Q/K/ King and Queen in the initial practice), and leave 40 cards of 1 ~ 10, and use 1 instead of A.

Randomly draw 4 cards, and calculate the number on the card face into 24 by addition, subtraction, multiplication and division. Each card can only be used once. If the cards drawn are 3, 8, 8 and 9, the formula is (9-8)×8×3=24.