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Well... I'm not here to update, I'm here to post... Don't be impulsive, I don't mean to open a new pit! This article is finished, it's not easy~~~ This article is the product of when I was writing math problems until I was on the verge of schizophrenia. = = So I was very entangled, really entangled... I strongly recommend that you don't think too much about math problems, it can really make people schizophrenic—— As for the content, I can only tell you that this is not a Valentine's Day greeting, but a Tomb-Sweeping Day greeting… Please consider carefully whether you want to read it or not. By the way, this year's Qingming Festival is April 4th, so it's auspicious~~~Hahaha~~~ Intention: