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标题: 数学题~求助哦 [打印本页]

作者: momohere88 时间: 2008-8-17 16:18 标题: 数学题~求助哦

Q28:

For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. What is the sum of all the even integers between 99 and 301?

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