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义务教材《数学》第五册P47第12题:拿12厘米长的铁丝,围成几种不同的长方形或正方形。它们的周长一样吗?它们的面积怎样?分别填在下面的表里。
Compulsory textbook “Mathematics” fifth volumes P47 12 questions: Take 12 cm long wire, surrounded by several different rectangles or squares. They are the same circumference? How are their area? Fill in the following table.