态度决定一切对数与对数运算基础练习一、对数的概念与性质1、把下列指数式写成对数式:3(1)2811(2)22131(3)273(4)1()5.733m2、把下列对数式写成指数式:3(1)log925(2)log125321(3)log2431(4)log4813、求下列各式中x的值:642(1)log3xlog86x(2)lg100x(3)2lnex(4)-4、求下列各式的值:51log125()212log16()3lg1000()lg0.001(4)15log15(5)0.4log1(6)9log81(7)(8)1327log(9)2log42(10)279log(11)lg10510(12)11664log二、对数的运算1、基础练习(1)lg2lg5(2)18233loglog(3)lg243lg9态度决定一切93289(4)loglog1681932(5)loglog(23)(23)(6)log2、加强巩固32220415151515(1)1logloglogoglg2lg5lg8(2)lg50lg407(3)1142lglg7lg183glg4lg51(4)2lg0.5lg82223186666(5)(log)logloglog2(6)lg2lg2lg5lg533224839(7)(loglog)(loglog)3210loglog15(8)1010log134log22729(9)loglog43948228393(10)(loglog)(logloglog)态度决定一切3、综合应用(1)设lg2a,lg3b,试用a、b表示4356lg,log,log122.(2)已知3723log,logab,用,ab表示5642log.(3)已知2235log,logab,试用,ab表示9030log.213436xyxy(4)已知,求的值。态度决定一切