e的来源有二：来源一：楼主先算一算以下各式,就能明白e为何物：(1 + 1/1)^1 = 1(1 + 1/2)^2 = (1 + 1/3)^3 = 2.37037037.(1 + 1/4)^4 = (1 + 1/5)^5 = 2.48832000(1 + 1/10)^10 = (1 + 1/20)^20 = 2.653297705.(1 + ...