搜题
求函数的定义域：z=√x2-9+(1/√9-y2)．
二项式(x3+1/x2)n(x≠0)的展开式里，只有第6项的系数最大，则不含x的项是第____项，此项为____．
Wewilltake________wantstogothereforasight-seeing.
A.whoever
B.who
C.anybody
D.allthat
Marylooksgreat_____thispairoftrousers.
A.in
B.by
C.on
D.at
B"Areyoucrazy?"peoplearoundhimshoutedasAlexBien,a33-year-oldimmigrant（移民）,rantowardthreecarsinachainaccidentalongthehighwayinMiami,whichwereburningdown.Alexdidn'tthinktwice.Thearticle"AgainsttheFlames"reportedhowheputoutthefireonacarandpulledacoupleoutofanother.Butwhenhereturnedtohisowncar,steamwascomingoutofit.Itwasdamagedbeyondrepair.Backinhistinyflat,aloneandwithlittlemoney,Alexdidn'tknowwhattodo.Hewasalreadyworking,goingtocollegeandsupportinghiswife,Aline,andchildrenbackinHaiti.Heworriedabouthiswife'shealth;doctorsthoughtshehadcancer（癌症）.Everycentwasimportanttohim.Andnowthis.Withinweeksofreadingthearticle,readerssenthundredsoflettersofferingjobs,moneyandbestwishes.Onedeliveredacar—used,butinfinecondition.OthershelpedAlinecometoMiami,whereamedicalteamfoundoutitwasnotcancer.ReadersalsowrotetoU.S.governmentofficialstosupporttheimmigrationofAlex'sfamilytoMiami.CousulGeneralRogerDaleyeveninvitedAlextodiscussthematter.Aline,togetherwiththeirchildren,joinedAlexinMiamithispastMarch.Alexsays,"Iwouldliketosayabeautifulthankstothereaders.Therearegoodpeopleeverywhereinthisworld."WhydidpeoplesaythatAlexwascrazy?
A.Hehadanaccident.
B.Hemadeafireonthehighway.
C.Heburnedhiscar.
D.Herantowardtheburningcars.
①5(3a-2b)2-2(2a+3b)2-3(2b-3a)2+4(3b+2a)2；②x2-(1/2)xm+1-(1/5)xm-2xm+1；③(a-1/2)2(a2+1/4)2(a+(1/2)]2；④[-(3/4)x6y3+(6/5)x3y4-(9/10)xy2]÷(3/5)xy2．
抛物线y2＝4x上一点P到焦点F的距离是10，则点P坐标是（）
A.(9，6)
B.(9，±6)
C.(6，9)
D.(±6，9)
Themajorityofthedamage______easytorepair.
A.is
B.are
C.were
D.be
若f(x)=x3+αx2+bx+c，且f(0)=0为函数的极值，则()
A.c≠0
B.当α>0时，f(0)为极大值
C.b=0
D.当α
曲线y=1/(x+1)在点(1，1/2)处的切线方程是()
A.x+4y-3=0
B.4x+y-3=0
C.x-4y-3=0
D.4x+4y-3=0
以抛物线y2＝8x的焦点为圆心，且与此抛物线的准线相切的圆的方程是（）
A.(x＋2)2＋y2＝16
B.(x＋2)2＋y2＝4
C.(x－2)2＋y2＝16
D.(x－2)2＋y2＝4