2019 AMC 8 第 11 题
先试着解答 2019 AMC 8 第 11 题，然后核对你的答案与视频与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2019 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
11.
Lincoln 中学八年级有 名学生。每名学生上数学课、外语课，或两者都上。八年级有 人上数学课，有 人上外语课。有多少八年级学生只上数学课而不上外语课？
The eighth grade class at Lincoln Middle School has students. Each student takes a math class or a foreign language class or both. There are eighth graders taking a math class, and there are eighth graders taking a foreign language class. How many eighth graders take only a math class and not a foreign language class?
小提示：
先求有多少学生被两类人数重复计算
First find how many students are counted twice
大提示：
只上数学课的人数等于数学课总人数减去两课都上的人数
Only math = math total minus both classes
视频讲解：
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文字解答：
两门课都上的人数为 用上数学课的人数减去这个数，就得到只上数学课的人数。
所求人数为 。
正确答案是 D。
The number of kids that are taking both classes is Subtracting this from the number of kids taking a math class will give us the number of kids taking only a math class.
The desired number is
Thus, the correct answer is D.
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