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知道周长和宽求长是多少
更新时间: 2020-10-23 00:00:00  

根据公式:长=长方形的周长÷2-宽。宽=长方形的周长÷2-长。长+宽=长方形的周长÷2。即可求出长。长方形的周长是四条边的和,也就是:长+长+宽+宽,又因为长方形的对边相等。所以长方形的周长=2×(长+宽)。由此可知:长=长方形的周长÷2-宽。宽=长方形的周长÷2-长。

关键词: 知道 周长 多少

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