1） 立方体三面面积分别为84、70、30,求体积?
ab=84 bc=70 ca =30 -》abc=sqrt(ab*bc*ca)=4200
2) 地球多久自转一周?
24 hours
(公转是365天,自转是1天)
英语翻译1.The area of the faces of a rectangle box are 84平方厘米 70
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