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新增的其實是一個邊長為1的小正方形,和兩個一邊為1一邊為原邊長的長方形,你畫下圖就可以理解, 兩個長方形的面積是 17-1=16 所以一個長方形的面積是 16÷2=8 所以原邊長是 8÷1=8 所以原正方形面積是 8×8=64平方釐米 如果您滿意我的回答, 手機提問的朋友在用戶端右上角評估點【滿意】即可!
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