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时间:2018-08-09
《2012年北美sat考试答案》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2012年北美SAT攷試答案10月北美SAT大纲,科目,题库加Q99460235确保2320分)Q99460235实力成就辉煌,机会改变命运。 1.Iff(x)=│(x2–50)│whatisthevalueoff(-5) A.75 B.25 C.0 D.-25 E.-75 2.(√2-√3)2= A.5-2√6 B.5-√6 C.1-2√6 D.1-√2 E.1 3.230+230+230+230= A.8120 B.830 C.232 D.230 E.226 4.AmyhastovisittownsBandCinanyo
2、rder.Theroadsconnectingthesetownswithherhomeareshownonthediagram.HowmanydifferentroutescanshetakestartingfromAandreturningtoA,goingthroughbothBandC(butnotmorethanoncethrougheach)andnottravellinganyroadtwiceonthesametrip? A.10 B.8 C.6 D.4 E.2 5.InthefigureaboveAD=4,AB=3andCD=9.W
3、hatistheareaoftriangleAEC? A.18 B.13.5 C.9 D.4.5 E.3 答案: 1.CorrectAnswer:B Explanation: Ifx=-5,then(x2–50)=25–50=-25 Butthesign│x│meanstheabsolutevalueofx(thedistancebetweenthenumberandzeroonthenumberline).Absolutevaluesarealwayspositive. │-25│=25 2.CorrectAnswer:A Explanat
4、ion: Expandasfor(a+b)2. (√2-√3)(√2-√3)=2-2(√2+√3)+3=5-2√6 3.CorrectAnswer:C Explanation: Allfourtermsareidenticalthereforewehave4(230). But4=22,andsowecanwrite22.230 Whichisequivalentto232 4.CorrectAnswer:B Explanation: Amycantravelclockwiseoranticlockwiseonthediagram. Clockw
5、ise,shehasnochoiceofroutefromAtoB,achoiceofoneoutoftworoutesfromBtoC,andachoiceofoneoutoftworoutesfromCbacktoA.Thisgivesfourpossibleroutes. Similarly,anticlockwiseshehasfourdifferentroutes. Totalroutes=8 5.CorrectAnswer:D Explanation: IfwetakeAEasthebaseoftriangleAEC,thentheheighti
6、sCD.Theheightofthetriangleistherefore,9(given).1.Iff(x)=│(x2–50)│whatisthevalueoff(-5) A.75 B.25 C.0 D.-25 E.-75 2.(√2-√3)2= A.5-2√6 B.5-√6 C.1-2√6 D.1-√2 E.1 3.230+230+230+230= A.8120 B.830 C.232 D.230 E.226 4.AmyhastovisittownsBandCinanyorder.Theroadsconnectingtheseto
7、wnswithherhomeareshownonthediagram.HowmanydifferentroutescanshetakestartingfromAandreturningtoA,goingthroughbothBandC(butnotmorethanoncethrougheach)andnottravellinganyroadtwiceonthesametrip? A.10 B.8 C.6 D.4 E.2 5.InthefigureaboveAD=4,AB=3andCD=9.Whatistheareaoftriangl
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