故R=∞/∞=1,其值落在(0,1】內。
回答: 經驗老到!!!數學本身的內在邏輯令人讚歎,它知道放在頂點的球在沒有初速時不會自動滑下。因此小球滑到任何地方的時間都會是無窮大∞,
由 askerfor
於 2021-06-21 06:26:43
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