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已知直线l经过不等式组表示的平面区域,且与圆O:x2+y2=25相交于A,B两点,则当|AB|最短时,直线l的方程是( )
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高三上学期数学《》真题及答案
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直线2x+y-10=0与不等式组表示的平面区域的公共点有________个.
若点P.m3到直线4x-3y+1=0的距离为4且点P.在不等式2x+y
已知点P.xy在不等式组表示的平面区域上运动则z=x-y的取值范围是
[-2,-1]
[-2,1]
[-1,2]
[1,2]
已知实数xy满足约束条件设不等式组所表示的平面区域D.若直线y=ax+1与区域D.有公共点则实数a的
不等式2x-y-6>0表示的平面区域在直线2x-y-6=0的
左上方
右上方
左下方
右下方
已知点P.2t在不等式组表示的平面区域内则点P.2t到直线3x+4y+10=0距离的最大值为
2
4
6
8
点Pa4到直线x﹣2y+2=0的距离等于2且在不等式3x+y>3表示的平面区域内则P点坐标为.
不等式2x+y+1
右上方
右下方
左上方
左下方
设D.是不等式组表示的平面区域则D.中的点P.xy到直线x+y=10距离的最大值是.
在平面直角坐标系xOy中若点P.m1到直线4x-3y-1=0的距离为4且点P.在不等式2x+y≥3表
如果过点01斜率为k的直线l与圆交于M.N.两点且M.N.关于直线x+y=0对称那么直线l的斜率k=
已知直线l经过不等式组表示的平面区域且与圆Ox2+y2=16相交于AB两点则当|AB|最小时直线l
B两点,则当|AB|最小时,直线l的方程为( )
A.y-2=0
x-y+4=0
x+y-2=0
3x+2y-13=0
已知直线l经过不等式组表示的平面区域且与圆Ox2+y2=25相交于AB两点则当|AB|最短时直线l
2x+y﹣10=0
2x﹣y﹣6=0
x+2y﹣8=0
2x+y﹣8=0
已知关于xy的不等式组所表示的平面区域的面积为3则实数k的值为.
设不等式组表示的平面区域为M.若直线y=kx+1+1经过区域M.则实数k的取值范围是________
设xy满足则该不等式组表示的平面区域则z=2x+y的最大值是_____________.
设xy满足则该不等式组表示的平面区域则z=2x+y的最大值_________.
已知点P.xy在不等式组表示的平面区域上运动则z=x-y的最小值是
-2
2
-1
1
已知点Pxy在不等式组表示的平面区域内运动则z=x-y的取值范围是.
若点P.m3到直线4x-3y+1=0的距离为4且点P.在不等式2x+y<3表示的平面区域内则m=__
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FreedomandResponsibility Freedom'schallengeintheDigitalAgeisaserioustopic.Wearefacingtodayastrangenewworldandweareallwonderingwhatwearegoingtodowithit. Some2500yearsagoGreecediscoveredfreedom.Beforethattherewasnofreedom.Thereweregreatcivilizationssplendidempiresbutnofreedomanywhere.EgyptandBabylonwerebothtyranniesoneverypowerfulmanrulingoverhelplessmasses. InGreeceinAthens雅典alittlecityinalittlecountrytherewerenohelplessmasses.AndAthenianswillinglyobeyedthewrittenlawswhichtheythemselvespassedandtheunwrittenwhichmustbeobeyediffreemenlivetogether.Theymustshoweachotherkindnessandpityandthemanyqualitieswithoutwhichlifewouldbeverypainfulunlessonechosetolivealoneinthedesert.TheAtheniansneverthoughtthatamanwasfreeifhecoulddowhathewanted.Amanwasfreeifhewasself﹣controlled.Tomakeyourselfobeywhatyouapprovedwasfreedom.Theyweresavedfromlookingattheirlivesastheirownprivateaffair.EachonefeltresponsibleforthewelfareofAthensnotbecauseitwasforcedonhimfromtheoutsidebutbecausethecitywashisprideandhissafety.Theessentialbeliefofthefirstfreegovernmentintheworldwaslibertyforallmenwhocouldcontrolthemselvesandwouldtakeresponsibilityforthestate. Butdiscoveringfreedomisnotlikediscoveringcomputers.Itcannotbediscoveredonceforall.Ifpeopledonotprizeitandworkforititwillgo.Constantwatchisitsprice.Athenschanged.Itwasachangethattookplacewithoutbeingnoticedthoughitwasoftheextremeimportanceaspiritualchangewhichaffectedthewholestate.IthadbeentheAtheniansprideandjoytogivetotheircity.Thattheycouldgetmaterialbenefitsfromherneverenteredtheirminds.Therehadtobeacompletechangeofattitudebeforetheycouldlookatthecityasanemployerwhopaidhercitizensfordoingherwork.Nowinsteadofmengivingtothestatethestatewastogivetothem.Whatthepeoplewantedwasagovernmentwhichwouldprovideacomfortablelifeforthemandwiththisastheprimaryobjectideasoffreedomandself﹣relianceandresponsibilitywereneglectedtothepointofdisappearing.Athenswasmoreandmorelookedonasacooperativebusinesspossessedofgreatwealthinwhichallcitizenshadarighttoshare. Athensreachedthepointwhenthefreedomshereallywantedwasfreedomfromresponsibility.Therecouldbeonlyoneresult.Ifmeninsistedonbeingfreefromtheburdenofself﹣dependenceandresponsibilityforthecommongoodtheywouldceasetobefree.Responsibilityisthepriceeverymanmustpayforfreedom.Itistobehadonnootherterms.AthenstheAthensofAncientGreecerefusedresponsibilityshereachedtheendoffreedomandwasnevertohaveitagain. ButtheexcellentbecomesthepermanentAristotlesaid.Athenslostfreedomforeverbutfreedomwasnotlostforeverfortheworld.AgreatAmericanJamesMadisonreferredtoThecapacity能力ofmankindforself﹣government.NodoubthehadnotanideathathewasspeakingGreek.Athenswasnotinthefarthestbackgroundofhismindbutoncemanhasagreatandgoodideaitisnevercompletelylost.TheDigitalAgecannotdestroyit.Somehowinthisorthatman'sthoughtsuchanidealivesthoughunconsideredbytheworldofaction.Onecanneverbesurethatitisnotonthepointofbreakingoutintoactiononlysurethatitwilldososometime. 65.WhatdoestheunderlinedwordtyranniesinParagraph2referto? A.Countrieswheretheirpeopleneedhelp. B.Powerfulstateswithhighercivilization. C.Splendidempireswherepeopleenjoyfreedom. D.Governmentsruledwithabsolutepower. 66.Peoplebelievinginfreedomarethosewho. A.regardtheirlifeastheirownbusiness B.seekgainsastheirprimaryobject C.behavewithinthelawsandvaluesystems D.treatotherswithkindnessandpity 67.WhatchangeinattitudetookplaceinAthens? A.TheAtheniansrefusedtotaketheirresponsibility. B.TheAtheniansnolongertookprideinthecity. C.TheAtheniansbenefitedspirituallyfromthegovernment. D.TheAthenianslookedonthegovernmentasabusiness. 68.WhatdoesthesentenceTherecouldbeonlyoneresult.inParagraph5mean? A.Athenswouldcontinuetobefree. B.Athenswouldceasetohavefreedom. C.Freedomwouldcomefromresponsibility. D.FreedomwouldstopAthensfromself﹣dependence. 69.WhydoestheauthorrefertoAristotleandMadison? A.Theauthorishopefulaboutfreedom. B.Theauthoriscautiousaboutself﹣government. C.TheauthorisskepticalofGreekcivilization. D.Theauthorisproudofman'scapacity. 70.Whatistheauthor'sunderstandingoffreedom? A.Freedomcanbemorepopularinthedigitalage. B.Freedommaycometoanendinthedigitalage. C.Freedomshouldhavepriorityoverresponsibility. D.Freedomneedstobeguaranteedbyresponsibility.
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