小圆们是有重叠的,怎么能正好覆盖1/3个O?
"3)三个圆o覆盖圆O的充分必要条件是o覆盖1/3个O" 这个说法不对吧?
所有跟帖:
• 没有说“正好”覆盖1/3个O呀 -15少- ♂ (432 bytes) () 03/13/2023 postreply 14:45:39
• 没有说“正好”覆盖1/3个O呀 -15少- ♂ (432 bytes) () 03/13/2023 postreply 14:45:39
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