save your time。孩子會了就行了。美國很多中學數學、物理老師糊塗到姥姥家去了，跟他們壓根就掰扯不清

来源: 喀爾判0715 于 2025-08-26 19:13:04 [旧帖] [给我悄悄话] 本文已被阅读：次

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