最强大脑之24点速算

Super Brain: 24 Points is a math puzzle for calculation, decomposition, and planning. Each issue gives four numbers. Use every number exactly once and combine them with addition, subtraction, multiplication, and division to make 24. Select two numbers, choose an operator, and use the result in the next step. Division is always stored and shown as a reduced fraction, so 3 ÷ 24 becomes 1 over 8 instead of a rounded decimal. Goal: use the given 4 numbers with addition, subtraction, multiplication, and division to make the result equal 24. Rules: each number must be used exactly once. Numbers cannot be reused or ignored. Parentheses may be used to adjust operation order. Integers and fractions may appear during calculation, but the final result must be exactly 24. Number range: the game usually uses numbers from 1 to 13, including A=1, J=11, Q=12, and K=13, and may also support custom ranges. The bank contains 1,299 verified solvable issues: 433 easy, 433 medium, and 433 difficult. Easy issues use small distinct values; medium introduces 10–13; difficult issues use repeated high values and reward planning ahead. No issue starts with 24 as its answer. Short description: Use 4 numbers and arithmetic operations to make 24.