一个长方体从中间正好能分成两个小正方体,这时表面积增加20平方厘米,原来长方体的表面积是______平方厘米.
人气:311 ℃ 时间:2019-08-18 12:51:24
解答
20÷2×(12-10)
=10×10
=100(平方厘米);
答:原来长方体的表面积是100平方厘米.
故答案为:100.
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