一个正方体的棱长总和是3分米,它的表面积是多厘米?
人气：336 ℃ 时间：2019-10-19 05:43:24
解答
边长a
12a=3dm=30cm
a=2.5cm
表面积=6aa=6X2.5X2.5=37.5平方厘米
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