冲激函数与单位阶跃函数数，下面这段文字是怎么回事，按照求导法则的话，结果中第一项是不是缺了一个指数函数？

来源：蜘蛛抓取(WebSpider) 时间：2012-05-10 09:56 标签： 单位阶跃函数
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