求解 Gmat数学题 翻译加解题思路 高手救命啊!!! 5
1.if3<x<100,forhowmanyvaluesofxis3分之Xthesquareofaprimenumber?2.aresearcherplanstoidea...
1.if 3<x<100,for how many values of x is 3分之X the square of a prime number ?
2. a researcher plans to ideantify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. what is the least number of letters that can be used if there are 12 participants , and each participant is to receive a different code?
3.An object thrown directly upward is at a height of h feet after t seconds, where h=16(t-3)^2+150, at what height, in feet , is the object 2 seconds after it reaches its maximum height?
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2. a researcher plans to ideantify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. what is the least number of letters that can be used if there are 12 participants , and each participant is to receive a different code?
3.An object thrown directly upward is at a height of h feet after t seconds, where h=16(t-3)^2+150, at what height, in feet , is the object 2 seconds after it reaches its maximum height?
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2014-02-25
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3.问题的大意是当物体上升达其最大高度后的2秒后,物体的高度为多少。由公式知道物体要达最大高度要3秒,然后3秒之后再2秒就是用时5秒,将5秒代入公式可得h=86
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1。如果3 < x < 100,多少值x是3分之x的平方的素数吗? 2。研究人员计划ideantify每个参与者在一个特定的医学实验代码或者一个字母组成的或一对不同的字母写在字母顺序排列。什么是最少的字母,可以使用如果有12个参与者,每个参与者将收到一个不同的代码? 3。一个对象是直接向上抛出的高度h t秒后的脚,h = 16(t - 3)^ 2 + 150,
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