两个表面积是30平方厘米的正方体拼成一个长方体,该长方体的表面积是( )
A. 60cm2
B. 50 cm2
C. 30 cm2
D. 72 cm2
人气:133 ℃ 时间:2019-09-26 01:15:52
解答
30×2-30÷6×2,
=60-10,
=50(平方厘米).
答:这个长方体的表面积是50平方厘米.
故选:B.
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