1999 AMC 8 第 9 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
9.
如图，三个花坛互相重叠。花坛 有 株植物，花坛 有 株植物，花坛 有 株植物。花坛 和 共有 株植物，花坛 和 共有 株植物。植物总数是
Three flower beds overlap as shown. Bed has plants, bed has plants, and bed has plants. Beds and share plants, while beds and share The total number of plants is
小提示：
先把三个花坛的数量相加
Add the three bed counts first
大提示：
减去被重复计算的重叠部分
Subtract the overlaps that were counted twice
解答：
有 株植物在两个花坛中，且没有植物同时在三个花坛中。
所以植物总数为 减去重叠部分是为了去掉被计算两次的植物。
所以正确答案是 C。
Note there are plants that are in two beds and there are no plants in all three beds.
The total number of plants is then We subtract to get rid of the plants that we counted twice.
Thus, C is the correct answer.
其他年份的第 9 题
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