暑假輔導,數學複習有個單元叫數列,
有等差等比之類的,
數學老師就說:想知道a10就去問a9,想知道a9就去問a8…就像松下問童子……
朕:喵喵喵?
ns216.73.217.39da2 216.73.217.39
ns216.73.217.39da2
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