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[Issue Essay]

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题目:

Analytical!

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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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求may老师解答

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求may老师解答

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提问:

老师你好,数学课本第29页例4题,我没看懂解答1和2中的组合问题。谢谢!

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解答: 徐小梅老师

提问:

这一题没看懂是怎么解M和N的,为什么等于84?不是改86吗?

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解答: 徐小梅老师

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老师没听懂,哪里来的2呢

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2的三次方 5的三次方是什么呀?

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提问:

np 2*2是什么意思 不懂为什么选E

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解答: 徐小梅老师

提问:

老师你好 这道题的n怎么选数字来解它 那么多数字 为什么偏要选择0 1 2…?

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解答: 徐小梅老师

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老师你好,左边这道题解法听明白了,但是3k加2乘以15k加3这个方程不会解,最近看好多题都是不知道怎么解方程,我全忘了。数学书我看了,有概念,但是没教怎么解方程的!请先告诉我这道题那个地方是怎么回事,再教我怎么做,谢谢!

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解答: 徐小梅老师

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