8月1日 GMAT数学逻辑每日一练

　　8月1日 GMAT数学逻辑每日一练

　　【数学】

　　What is the value of v^3 – k^3?

　　(1) vk > 0

　　(2) v – k = 6

　　A. Statement (1) ALONEis sufficient, but statement(2) alone is not sufficient.

　　B. Statement (2) ALONEis sufficient, but statement(1) alone is not sufficient.

　　C. BOTH statements TOGETHERare sufficient,but NEITHERstatement ALONEis sufficient.

　　D. EACHstatement ALONEis sufficient.

　　E. Statements (1) and (2) TOGETHERare NOTsufficient.

　　【逻辑】

　　Anthropologists assert that cultures advance only whenindependence replaces dependence---that is, only when imposition by outsidersis replaced by initiative from within. In other words, the natives of a cultureare the only ones who can move that culture forward. Non-natives may providevaluable advice, but any imposition of their views threatens independence andthus progress. If one looks at individual schools as separate cultures,therefore, the key to educational progress is obvious:

　　which one of the following best completes the passage?

　　A. individualschools must be independent of outside imposition

　　B. some schoolsrequire more independence than others, depending on the initiative of theirstaffs and students

　　C. school systemsofficials must tailor their initiatives for change to each individual school inthe system

　　D. outsiders must beprevented from participation in schools’ efforts to advance

　　E. the moreindependent a school is, the more educational progress it will make

　　答案

　　【数学】

　　参考答案：E

　　题目翻译：v^3 – k^3的值是多少

　　题目全解：(1)v*k大于0，in；

　　(2)v-k=6，in；

　　(1)+(2)，无法得出结论，in。

　　【逻辑】

　　参考答案:A

　　思路：A可由文中可得到: cultures advance必要条件是 when independence replaces dependence---that is, only when imposition by outsiders is replaced by initiative from within, 而问题问的是: educational progress, 所以根据cultures advance的必要条件可以推出A, Assumption: individual schools as separate cultures

　　B，C，E无

　　D错误，因为: Non-natives may provide valuable advice

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