如圖,所求麵積=(長方形麵積-左下角小長方形)/2=(112-3*4)/2=50

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妙!
-貧論貧論-
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02/04/2026 postreply
06:37:14
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確實秒;我提供一個笨點的辦法
-monseigneur-
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02/04/2026 postreply
17:49:42
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