如图,所求面积=(长方形面积-左下角小长方形)/2=(112-3*4)/2=50

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妙!
-贫论贫论-
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02/04/2026 postreply
06:37:14
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确实秒;我提供一个笨点的办法
-monseigneur-
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02/04/2026 postreply
17:49:42
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