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用两个长6cm,宽4cm,高2cm的长方体拼成一个大长方体,这个大长方体的表面积最大是( )cm2,最小是( cm2. )
用两个长6cm,宽4cm,高2cm的长方体拼成一个大长方体,这个大长方体的表面积最大是( )cm2,最小是( cm2. )
发布时间:2020-08-17 04:12:33
用两个长6cm,宽4cm,高2cm的长方体拼成一个大长方体,这个大长方体的表面积最大是( )cm2,最小是( cm2.
)
网友回答
因为拼成长方体后会减少两个面
每个长方体的表面积为2*(6*4+2*4+2*6)=88
所以最大为88-2×(2*4)=72
最小为88-2×(4*6)=40
网友回答
最大为:160 (12*4*2)+(12*2*2) +(4*2*2)=160 最小为:128 (6*4*2)+(6*4*2)+(4*4*2)=128
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