加一個不同思路的解：

來源: 萬斤油於 2024-01-05 16:44:32 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

如圖，連接矩形AGFC的中點和梯形GBEF的中位線的中點可解決問題

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