1. Solve with 3× 8 = 24 and 4× 6 = 24. Try to add the four numbers on the card surface to 3 and 8, 4 and 6, and then multiply them to solve. For example, 3,3,6 and 10 can form (10-6 ÷ 3) × 3.

2. Use the operational characteristics of 0, 1 1 to solve it. For example, 3,4,4,8 can form 3× 8+4-4 = 24, and for example, 4,5, j and k can form 1 1× (5-4)+65438.

3. In the deck with solutions, the following six solutions are widely used: (We use A, B, C and D to represent the four numbers on the deck) ① (A-B )× (C+D) such as (10-4 )× (2+2) = 24, etc.

② (a+b) ÷ c× d as (10+2) ÷ 2× 4 = 24, etc.

③ (a-b ÷ c) × d is (3-2 ÷ 2) × 12 = 24, etc.

(4) (a+b-c) × d, such as (9+5-2 )× 2 = 24.

⑤ A× B+C-D is11× 3+L-10 = 24, etc.

⑥ (A-B )× C+D, such as (4-L )× 6+6 = 24.

Extension:

"Clever 24 points" is a math game. The game is simple and easy to learn, and it can also strengthen the brain and improve intelligence. The content of the game "Clever 24 Points" is as follows: There are 52 cards left in a deck, and 4 cards can be randomly drawn (called secondary cards) (only 40 cards of 1 ~ 10 can be used in the initial practice). Add, subtract, multiply and divide (brackets can be added) to calculate that the number on the card surface is 24. Each card can only be used once. If the cards drawn are 3, 8, 8 and 9, then the formula is (9-8) × 8× 3 or 3× 8+(9-8) or (9-8).

According to the accurate calculation by computer, four cards (52 cards) in a deck can be randomly selected with 1820 different combinations, among which 458 cards can't be counted as 24 points, such as A, A, A and 5. It is not difficult to see that "calculating 24 points skillfully" can greatly mobilize the coordinated activities of eyes, brain, hands, mouth and ears.

References:

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