若一个长方体的侧面展开是正方形,且这个长方体侧面积为400平方米则长方...
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答:因为长方体的侧面积等于底面周长乘以高,设高是h,则底面周长也是h,因为h²=400,所以h=20,所以长方体的底面周长是20米