If -7x5 and -3y4, what is the greatest possible value of(y-x)(x+y)?

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问题 If -7

5 and -3

4, what is the greatest possible value of(y-x)(x+y)?

选项

答案99

解析 The correct answer is 99. Because you are looking for the greatest value of(y- x)(x + y), your goal is to make x + y as big as possible and y- x as big as possible. Therefore, from the range of values given, choose x= 5 and y=4 to get x + y=9, and x= -7 and y=4 to get y-x=ll. The greatest value of(y-x)(x + y)is(9)(11)= 99.

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本试题收录于： GRE QUANTITATIVE题库GRE分类

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GRE

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If -7x5 and -3y4, what is the greatest possible value of(y-x)(x+y)?

GRE QUANTITATIVE

GRE

ABritishteenagerhasbecomeamulti-millionaireaftersellinganapplicationsoftwarehecreatedtowebgiantYahoo.Thedeal

Impatiencehasbeenaroundforalongtime.Thereisnothingnewaboutpeoplelosingtheirpatiencewhilestuckintrafficorwa

Atthattime,Englandhadmanycoloniesaroundtheworld.

Greenseaturtles(海龟)aretheworld’slargestspeciesofhard-shelledseaturtle.Whilemostindividualsweighabout136to181

Justasthelionrepresentsstrength,thepigeonis______peaceingeneralcases.

Allthefollowingcasesareon-the-jobsmokingexceptthat______.Inthesecondpartofthepassage,theauthorsuggestsbannin

Whatdoweknowfromthefirstparagraph?Whichofthefollowingistrueaccordingtothepassage?

Themaincauseofpollutionis______.Whichofthefollowingcannothelpsolvingtheproblemofpollution?

Staffhavebeenholdinganumberof______toraisemoneyforcharity.

IfZisrepresentedbythedecimal0.W7,whatisthedigitW?

职业纪律的普遍适用性是指：在职业纪律面前________。

出境货物最迟应于报关或装运前7天向检验检疫机构报检，个别检验检疫周期较长的货物，应留有相应的检验检疫时间。( )

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