真题示例(2024 年第 12 题): "Ifx+y=7andx2+y2=25, what is the value ofxy?"
考点:代数恒等式((x+y)2=x2+2xy+y2)
步骤:
代入已知:72=25+2xy
计算:49=25+2xy→2xy=24→xy=12
🔍几何模块
真题示例(2023 年第 22 题): "A regular hexagon is inscribed in a circle with radius 6. What is the area of the hexagon?"
考点:正六边形与圆的关系(边长 = 半径)
步骤:
分割为 6 个等边三角形,边长 = 6
单个三角形面积:43×62=93
总面积:6×93=543
🔍数论模块
真题示例(2022 年第 19 题): "What is the greatest three-digit number that is divisible by 4 and 10?"
考点:最小公倍数 + 整除性
步骤:
求 LCM (4,10)=20
最大三位数 ÷20:999÷20=49.95
取整:49×20=980
🔍组合模块
真题示例(2021 年第 24 题): "A bag contains 3 red marbles, 4 green marbles, and 5 blue marbles. If three marbles are drawn at random without replacement, what is the probability that all three are green?"