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1樓 218.88.141.*
2011-3-18 22:03
V4=a^4
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2樓 218.88.141.*
2011-3-18 22:06
1cm4=10000mm4(也就是1e4mm4)
1dm4=1e4cm4
1m4=1e4dm4
1hm4=(1e4)^2=1e8m4
1km4=1e12m4
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3樓 218.88.141.*
2011-3-18 22:06
1四次方千米就是1000000000000四次方米!
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4樓 218.88.141.*
2011-3-18 22:38
棱长是3dm的超正方体,体积是:
V4=3^4=81(dm4)
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