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重心、垂心、外心、内心、旁心,让你考试顺心;
九点圆、外接圆、旁切圆、内切圆,让你圆圆满满;
调和点列、调和数列、调和级数,帮你风调雨顺,家和万事兴;
幸福是可导的,
时间是可微的,
祝福是连续的,
记忆的曲线是凸的,
思念的曲线是凹的,
遗忘你的点是不存在的!
最后祝老李:
烦恼高阶无穷小,
好运连续且可导,
理想一定洛必达,
拉格朗日天天照,
生活不单调,
道路不凸凹,
f'(心情)>0,
lim快乐=无穷大!
新春快乐!