共计2.5小时考试时间
此套试卷由三部分题目组成
4题简答题,每题4分
4题挑战题,每题6分
4题解答题,每题10分
共计12题,满分80分
不可使用任何计算器
完整版下载链接见文末
A2. Triangle ABC has integer side lengths and perimeter 7. Determine all possible lengths of side AB.
Solution: By the triangle inequality, the largest possible length of any side is 3. Moreover, if all side lengths were less than 3, the perimeter would be less than 7. Thus, at least one side has length 3. This leaves the other sides has (2,2) or (1,3). Thus, AB can be 1, 2, or 3.
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