1、一、选择题1在正项等比数列an中,lg a3lg a6lg a96,则a1a11的值是()A10 000B1 000C100 D10导学号03350113解析:选A.在正项等比数列an中,lg a3lg a6lg a96,lg(a3a6a9)6,a3a6a9106,a106,a6100,a1a11100210 000,故选A.2若a,则loga的值为()A.B.C3D导学号03350114解析:选C.由a得,loga ,即loga.logaloga3.3化简2的值为()A6 B8C9 D12导学号03350115解析:选A.原式23(322)213236.4设log23,则3x3x的值为()A
2、. B.C. D.导学号03350116解析:选B.由log23,得3x2,3x3x2.5log2 25log3 4log5 9的值为()A4 B6C8 D10导学号03350117解析:选C.原式8.6已知a5log23.4,b5log43.6,clog30.3,则下列正确的选项为()Aabc BbacCacb Dcab导学号03350118解析:选C.clog3 0.35log3 0.35log3,log2 3.4log221,log4 3.6log4 41,log3log331,又log23.4log2log3,log23.4log3log43.6,又y5x在R上是增函数,来源:acb.
3、学科网7设a,b,c是不相等的正数且a,b,c成等比数列,令amcnb,则的值为()A1 B 2C. D.导学号03350119解析:选B.由amcnb,得mlogab,nlogcb,且b2ac,则logb(ac)logbb22.8设函数f(x),则f(f()()A. B1C D.导学号03350120解析:选D.因为f()ln ,所以f(f()fe.9若非零实数x,y,z满足2x3y6z,则()A.(5,6) B.(4,5)C.(3,4) D.(2,3)导学号03350121解析:选B.由题意,令2x3y6zk(k0,且k1),则xlog2k,ylog3k,zlog6k,所以log26log
4、361log231log32224,又2log23log322215,故选B.10已知xx3,则的值为()A7 B 47C18 D.导学号03350122解析:选D.由已知xx3,得xx17,再平方得x2x247,又xx(x)3(x)3(xx)(xx11)3(71)18,原式.11已知函数f(x)logax(a0且a1)若f(x1x2x2 017)5,则f(x)f(x)f(x)等于()A5 B10C15 D53导学号03350123解析:选C.f(x)f(x)f(x)logaxlogaxlogax3(logax1logax2logax2 017)3loga(x1x2x2 017)3515.12
5、已知函数f(x)是定义在R上的奇函数,当x0时,f(x)2flog2x,则f(2)()A1 B3C1 D3导学号03350124解析:选D.由f2flog22f,得f()1,所以当x0时,f(x)2log2x,所以f(2)2log223,又f(x)是奇函数,所以f(2)f(2)3.二、填空题13已知4a2,lg xa,则x_.导学号03350125解析:由4a2,得a,又因为lg xa,所以x10.答案:14定义运算:Sab,运算原理如图所示,则ln elg 1001的值为_导学号03350126解析:因为ln e212(11)4,lg 1001233(21)9,故原式13.答案:1315lg lg 4log23_.导学号03350127解析:原式lg 5lg 2022log23lg(520)2log29lg 1009198.答案:816._.导学号03350128解析:原式1.答案:1