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这不是绝对的。有的积分是发散的,有时是收敛的,看衰减速度了。你说的无穷个数
-还是没笔名-
♂
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12/21/2012 postreply
18:22:59
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一尺之棰,日截其半,万世不竭
-精灵宝钻-
♂
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12/23/2012 postreply
23:12:11
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