对数函数基础练习题.doc

(完整版)对数函数基础练习题 对数函数基础练习题选择题1与函数y（)x的图像关于直线yx对称的函数是 （)Ay4x By4xCylogx Dylog4x2下列结论正确的是 (）lg(lg10）0lg（lne)0若10lgx则x10若elnx,则xe2A BC D3已知logx83,则x的值为 ()A. B2C3 D44log5b2，化为指数式是 （）A5b2Bb52C52b Db255若a0，且a1，xR,yR，且xy0，则下列各式不恒成立的是 （）logax22logax；logax22logax;loga(xy）logaxlogay；loga(xy）loga|xlogay|。ABC D6计算log916log881的值为 （）A18 B。C. D。7已知lg2a,lg3b，则log36 （）A. B.C. D.8lg83lg5的值为 (）A3 B1C1 D39 的值是（ ) A B1 C D210已知x=+1，则log4(x3x6）等于( )A. B。C。0 D。11。已知f（ex）=x，则f(5）等于（ ）Ae5 B5eCln5 Dlog5e12log5b2，化为指数式是 （)A5b2Bb52C52b Db2513。函数y=log（2x1）的定义域是（ ）(A）(，1）（1，+) (B）（，1）(1，+）（C）(,+） （D）（，+)14。若logm9logn90，那么m,n满足的条件是（ ）（A）mn1 （B）nm1 （C)0nm1 （D）0mn115若1xb，a=logbx，c=logax,则a，b,c的关系是( ）（A）abc （B）acb (C）cba （D）ca5或a2 B2a3或3a5C2a5 D3a421方程2log3x的解是 (）A9 B。C。 D。22log5log3（log2x）0，则x等于 （）A。 B。C。 D。23若log34log8mlog416，则m等于 ()A3 B9C18 D2724函数ylogax的图像如图所示,则实数a的可能取值是(）A5 B。C. D。25设alog3，b(）0.3，c2,则a,b,c的大小关系是 ()Aabc BcbaCcc BcbaCcab Dacb27（2011天津高考)设alog54,b（log53）2，clog45,则 ()AacbBbcaCabc Dbac填空题1函数y=log(x-1)(3-x)的定义域是 。2lg25+lg2lg50+（lg2)2= 。3。log2。56。25lgln= 4。已知m1，试比较(lgm)0。9与(lgm）0.8的大小 5已知函数f（x)=1lg（x2），则f1(1）_6 若log30,则x_。7 7若a0，a2，则loga_。8log6log4（log381)_.9log_.10若loga2m,loga3n，则a2mn_.11对数函数的图像过点（16，4)，则此函数的解析式为_12已知函数y3loga（2x3)（a0且a1)的图像必经过定点P，则P点坐标_13方程x2logx解的个数是_解答题1将下列指数式化为对数式，对数式化为指数式：（1) x8；(2）logx646;（3）lg1 0003。解：（1）由x8，得xlog8；(2)由logx646,得x664；（3)由lg1 0003，得1031 000.2求下列各式中x。（1）log2x；(2)log5(log2x）0.3计算下列各式的值（1)log2log212log242；(2）log225log34log59。4计算下列各式的值：（1)；（2）lg2lg5031log92；这可让他犯了难，施工现场距离项目部很远，没有车还真是不方便office, branch offices (jurisdiction), risk management, marketing management sector through supervision and inspection found problems, should be assigned the investigators are corrected in a timely manner. 27th the fifth chapter penalty under any of the following acts, then the relevant provisions to punish the investigators, according to the Bank. To constitute a crime shall be investigated for criminal responsibility: (A) on the business that are not involved in the investigation, issued a survey. (B) customer credit information are not thorough verification. (Iii) to participate in credit customer survey is not in place, customers and data is incomplete, untrue; he knows bear a counterfeited clients issuing credit. (D) does not provide for due diligence of credit business, pre-loan investigation form, concealing facts or providing false information or should be found in a normal investigation failed to discover the risk factors, lead to the review and approval policy errors, loan risk. (Five) on loan guarantees of survey not in place, not by provides on arrived, and pledge real for field verification, and assessment, and identification and registration, not according to provides on guarantor of guarantees qualification and guarantees capacity for survey verified, led to guarantees loan lost authenticity, and legitimacy, and effectiveness of; cycle loan business in the of mortgage