某上班族心血來潮開的新坑，想跳就跳吧。這不是數學，只是單純的速算，本人會盡量用最簡單易懂的方式讓你了解。有時也會補充些小知識，題目會從網路上抓，或是之前曾聽過的，有好題目也歡迎一起分享。1119Please respect copyright.ＰＥＮＡＮＡKpaIqMYwyD
有沒有發現封面的那隻吉祥物是由math組成的！
ns216.73.216.137da2
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