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[Issue Essay]

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题目:

Analytical!

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提问:

Most of the world's supply of uranium currently comes from mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable. Which of the following would it be most useful to determine in evaluating the argument? A.Whether the uranium in deposits on land is rapidly being depleted B.Whether most uranium is used near where it is mined C.Whether there are any technological advances that show promise of reducing the cost of extracting uranium from seawater D.Whether the total amount of uranium in seawater is significantly greater than the total amount of uranium on land E.Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater

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解答: sysadmin

提问:

请may老师回答

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解答: 徐小梅老师

提问:

求问此题的解题思路:已知整数0到k的乘积能被735整除。 问:k的最小值是多少?

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阅读231284
解答: 徐小梅老师

提问:

请教一下may老师第26题

解答:

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阅读231732
解答: 徐小梅老师

提问:

请教一下may老师第8题

解答:

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阅读231356
解答: 徐小梅老师

提问:

请教一下may老师23题

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阅读231194
解答: 徐小梅老师

提问:

求问此题的解题方法:符合k,k+2,k+4三个数都是质数的set有多少个?(k>1) 答案有:0, 1,2,3,>3。请问May老师这种题型该怎么求解呀?谢谢!

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阅读231308
解答: 徐小梅老师

提问:

从阴影中任取一点,问y小于x的概率是多少?

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阅读232026
解答: ken@boost.org.cn老师

提问:

想问一个数学题,有一组数,问能否确定range? 1. mean is given 2. standard deviation is given

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解答: ken@boost.org.cn老师

提问:

7/15寂静:所有员工都大于20岁. Of the 2000 employees, is the avg age at least 35? 1. 50% 员工是大于40岁 2. 25% 员工是大于65岁 这道题网上有C和E两种争论;我所不明白的点是:条件2中的25%是否包含在条件1的里面;我觉得答案应该是C。因为:35*2000=70000岁;(1)+(2)可得41*500+66*500+21*1000=74500>70000.不知道我的思路是否正确。谢谢老师的答疑!

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解答: 徐小梅老师

提问:

【请May老师回答】这题鸡精提供的答案是D 可是我觉得第二个条件不能得出呢 假设n三次方是x平方 除以n平方 是可以得到x/ n 平方 但是x/n 不一定是整数呀?

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解答: 徐小梅老师

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