How many positive whole numbers less than 81 are NOT equal squares of whole numbers?

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问题 How many positive whole numbers less than 81 are NOT equal squares of whole numbers?

选项 A、9
B、70
C、71
D、72
E、73

答案D

解析小于81且不等于整数的平方(square)的正整数(positive whole numbers)有多少个?
解：本题的正确答案是(D)。该题也就是问小于81的非完全平方数有多少个。小于81的完全平方数有1，4，9，16，25，36，49，64共8个，而小于81的正整数有80个，所以小于81的非完全平方数有80-8=72个。

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How many positive whole numbers less than 81 are NOT equal squares of whole numbers?

GRE QUANTITATIVE

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Forthepastseveralyears,theSundaynewspapersupplementParadehasfeaturedacolumncalled"AskMarilyn."Peopleareinvite

Increasingly,overthepasttenyears,people—especiallyyoungpeople—havebecomeawareoftheneedtochangetheireatinghabit

Normallyastudentmustattendanumberofcoursesinordertograduate,andeachcoursewhichheattendsgiveshimagradewhic

Thehotelstandsinaquietplace______themainroadatthefarendofthelake.

Textbookpricesaretraditionallyhigh."Combinedwiththerisingcostoftuition,thepriceofbooksforourstudentsisjust

Thesciencebehindsolar(太阳的)energyisnotnew.ButSheridanCommunitySchoolsisthefirstschooldistrictinIndianatobec

Ifthepopulationoftheearthgoesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourceslefttokee

Bigdatacanbedefinedasinformationthatistoobigorcomplextobecontainedorprocessedbyanyonemachineorperson.

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