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[Issue Essay]

试题详情

题目:

Analytical!

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答案:

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

解答:

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解答: sysadmin

提问:

DS:如果x和y是≥0的数,问3^xy次方是多少? 条件1:5^x=11^y 条件2:3^x=9^y 请问这题答案是B吗?谢谢老师!

解答:

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阅读234211
解答: 徐小梅老师

提问:

不明白这道题的总体积为什么是(x+2)(y+2)(z+2)而不是(x+1)(y+1)(z+1);厚度不是1吗?谢谢!

解答:

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阅读233831
解答: 徐小梅老师

提问:

我觉得这题答案应该是A吧?∵105拆分质因数可得105=3*5*7(3个完全不同的质因数)∴x+y+z=15。怎么会是C呢????

解答:

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阅读232255
解答: 徐小梅老师

提问:

向May提问,我觉得这题情况会分得很复杂,想听下老师的思路?

解答:

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阅读232759
解答: 徐小梅老师

提问:

想向May老师提问。这题我知道条件1单独成立,但对条件2没什么思路,只能想到穷举法,当p等于2*5,3*5,3*5,2*3,2*5,3*5时,m等于2*3,2*3,2*5,5,3,2,然后一个个除发现有的余数是1,有的余数大于1,条件2单独不成立。想问老师这个思路对吗?有没有更加简洁的思路?

解答:

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阅读232989
解答: 徐小梅老师

提问:

不懂此题。已知有A,B,C和D共4个人;问:现在从这四个人中选出3人,是ACD的概率是多少?请详细解释,谢谢老师!

解答:

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阅读231917
解答: ken@boost.org.cn老师

提问:

不理解第一个条件均值如何得出关于6倍数的结论,是连续7个数除7余数为5则为6的倍数,所以有一个6的倍数?

解答:

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阅读231032
解答: 徐小梅老师

提问:

不理解第一个条件均值如何得出关于6倍数的结论,是连续7个数除7余数为5则为6的倍数,所以有一个6的倍数?

解答:

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阅读231153
解答: 徐小梅老师

提问:

第8题的思路是以BC为底,从F向BC做垂线,跟BC交点H,FH为三角形FBC的高。然后三角形BFH跟三角形BDC相似,h:30=BF:BD,但是BF长度未知,望老师解答。

解答:

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阅读231128
解答: 徐小梅老师

提问:

第8题的思路是以BC为底,从F向BC做垂线,跟BC交点H,FH为三角形FBC的高。然后三角形BFH跟三角形BDC相似,h:30=BF:BD,但是BF长度未知,望老师解答。

解答:

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阅读231277
解答: 徐小梅老师

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