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"即使是竞赛的,也不会很难", 神童呀,快上天才班吧。我现在也就20以内加减法比较有把握了。
eglington
(eglington)
(#352731@0)
Last Updated: 2002-1-30
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离开学校太久了,要问我拉普拉斯变换,薛定鄂方程我不知道,还说得过去,可是昨天有人问我等比数列求和公式(x+x^2+x^3+x^4.....x^n),我竟然不知道,而且到今天也想不起来,推不出来......
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