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求问GRE1Maryreadfromthetopofpage10tothebottomofpage24in30minutes.Atthisrate,howlong,inminutes,willittakehertoreadfromthetopofpage25tothebottomofpage50?2比较大小Thevolumeofasolidcubewhosetotalsur
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求问 GRE
1 Mary read from the top of page 10 to the bottom of page 24 in 30 minutes.At this rate,how long,in minutes,will it take her to read from the top of page 25 to the bottom of page 50?
2 比较大小 The volume of a solid cube whose total surface area is 24 与 The volume of a 3-D rectangular solid whose total surface area is 25
1 Mary read from the top of page 10 to the bottom of page 24 in 30 minutes.At this rate,how long,in minutes,will it take her to read from the top of page 25 to the bottom of page 50?
2 比较大小 The volume of a solid cube whose total surface area is 24 与 The volume of a 3-D rectangular solid whose total surface area is 25
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答案和解析
30分钟读了15页,2分钟读1页；读26页需要26*2=52分钟.
正方体表面积是24,边长为2,体积为8；长方体表面积是25,可假设长2宽2高17/8,这样体积2*2*17/8>8=2*2*2；后者大.
正方体表面积是24,边长为2,体积为8；长方体表面积是25,可假设长2宽2高17/8,这样体积2*2*17/8>8=2*2*2；后者大.
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