(修复的)管卫东讲解GWD考题

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1、Whenpositiveintegerxisdividedbypositiveintegery,theremainderis9. Ifx/y=96.12,whatisthevalueofy?9675482512X=(96+0.12)Y0.12Y=9Y=75Thefigureaboveshowsthedimensionsofasemicircularcrosssectionofaone-waytunnel.Thesingletrafficlaneis12feetwideandisequidistantfromthesidesofthetunnel. Ifvehiclesmus

2、tnearthetopofthetunnelbyatleast½footwhentheyareinsidethetrafficlane,whatshouldbethelimitontheheightofvehiclesthatareallowedtousethetunnel?5½ft7½ft8½ft9½ft10ft理解问题：要画图：单的轨道是12feet而且等距，半圆形隧道里面还有一个长方形的轨道，从圆心开始从左从句开始延展6，以圆心垂直于半径为对称轴向上做垂线，由于大圆半径是10，所以高是8，车要低于0.5米，所以是7.5米，关键是那句话怎么理解。Theoperation

3、ÄisdefinedforallnonzeronumbersaandbbyaÄb=a/b–b/a. Ifxandyarenonzeronumbers,whichofthefollowingstatementsmustbetrue?I.                 xÄxy=x(1Äy)II.                xÄy=-(yÄx)III.              1/xÄ1/y=yÄx IonlyIIonlyIIIonlyIandIIIIandIIII.xÄxy=x(1Äy)左=X/XY-XY/X=1/Y-Y右=X（1/Y-Y/1),X消不掉，因此两边不等

4、II.xÄy=-(yÄx)成立III.1/xÄ1/y=yÄx成立后面懒得再做了，就是把握aÄb=a/b–b/a这样的定义，代入化简变形即可，选E把xy当成整体来做Ifaandbarepositive,islessthan?(1)   a=2b(2)   a+b>1Statement(1)ALONEissufficient,butstatement(2)aloneisnotsufficient.Statement(2)ALONEissufficient,butstatement(1)aloneisnotsufficient.BOTHstatementsTOGETHERares

5、ufficient,butNEITHERstatementALONEissufficient.EACHstatementALONEissufficient.Statements(1)and(2)TOGETHERareNOTsufficient.第一式=ab/(a+b)第二式=ab/1a、b为正数1)第一式=2b/3第二式=2b*b无法比较两式大小2）a+b>1so1/(a+b)<1/1soab/(a+b)

6、mpany'sonlycostsfortheprojectwereforlaborandmaterials.Wasthecompany'sprofitfortheprojectgreaterthan$150,000?(1)Thecompany'stotalcostwasthreetimesitscostformaterials.TC=3MC，LC=2MC，条件不够(2)Thecompany'sprofitwasgreaterthanitscostforlabor.PF>LC条件也不够Statement(1)ALONEissufficient,butstatement(2)a

7、loneisnotsufficient.Statement(2)ALONEissufficient,butstatement(1)aloneisnotsufficient.BOTHstatementsTOGETHERaresufficient,butNEITHERstatementALONEissufficient.EACHstatementALONEissufficient.Statements(1)and(2)TOGETHERareNOTsufficient.profit=500,000-C(m+l)>ClCm