x No Plagiarism!IffnbfXn6UAv3o4ZVzDsposted on PENANA 1,000,000粒沙子是一個丘,645Please respect copyright.PENANAvSL5zqtwW5一個丘減掉一粒沙子還是一個丘 ,645Please respect copyright.PENANAUsP7cYHVsd假如一直重複這清況的話(每次都減掉一粒沙子),到了最後會是一個丘等於一粒沙子嗎?216.73.216.33ns216.73.216.33da2