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無窮大和無窮小不是數.他們的乘法除非你特別去定義,不然是沒有意義的.在很多數學領域裏,也有一些從不同角度去定義無窮大和無窮小的乘法運算,但是很多都不太一樣,為了解你的疑惑我下麵給出一種在微積分裏常見的定義…
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