就是這些東西的combination. 說起來都懂, 一做題就錯. 每天搞數學了, 有的題做三遍還計算錯誤.

來源: cobmama 於 2024-04-14 20:51:31 [舊帖] [給我悄悄話] 本文已被閱讀：次

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