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In the rectangular coordinate system above, for how many of the points that lie
In the rectangular coordinate system above, for how many of the points that lie
游客
2024-01-13
60
管理
问题
In the rectangular coordinate system above, for how many of the points that lie inside or on the boundary of the shaded region are both coordinate integers?
选项
A、14
B、10
C、6
D、12
E、8
答案
D
解析
这种题目当然只能够枚举:
共有(0,0),(1,0),(2,0),(3,0)
(0,1),(1,1),(2,1),(3,1)
(0,2),(1,2),(2,2),(3,2),刚好是12个点。
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