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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本试题收录于： GRE QUANTITATIVE题库GRE分类

GRE QUANTITATIVE

GRE

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

GRE QUANTITATIVE

GRE

Forthispart,youareallowed30minutestowriteacompositiononthetopicAdvantagesanddisadvantagesoftheInternet.You

HumansmaynothavelandedonMars(火星)justyet,butthatisn’tstoppingaEuropeancompanyfromdevisingaplantosendfourp

Worldwidethereareprobably70to100sharkattacksannuallyresultinginabout5to15deaths.Wesay"probably"becausenota

Formorethan600yearspeoplehavecomplainedthatyoungsterscannotwriteproperEnglishanymore.Twouniversaltruthsemerge:

Itcanbereallyfrustrating(使人沮丧的)foranoverweightpersontogotoagymandworkoutwithapositiveattitude.Allonehasto

ThewaytheEarthinteractswiththesun’senergycanbedisplayedinadiagramcalledtheEarth’senergybudget.Itdisplayst

Oneofthebestpiecesofmedicalnewstoemergeoverthelastseveralyearsisthatchocolatemay【C1】______youlivelonger,pro

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