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作者 danial 在 PTT [ Math ] 看板的留言(推文), 共3則
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2F→: 謝謝,我懂了,要用 △BPI~△BIC~△IQC04/03 20:49
3F→: 角BPI=角BIC=角IQC 都是 90+1/2角A04/03 20:52
3F→: 謝謝樓上,原來是高級中學數學競賽的題目06/18 14:55
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