对数运算法则公式及其练习题

bnmbamanloglog对数运算法则公式1、babalog2、nmnmaaaloglog)(log3、nmnmaaaloglog)(log4、bnbanaloglog5、bnbaanlog1log6、abbccalogloglog(换底公式）7、1loglogabba1、求值：1、log89log27322、lg243lg93、44912log3log2log324、91log81log251log5325、4839(log3log3)(log2log2)6、2345log3log4log5log27、0.21log358、log427·log94＋log4464；9、(log2125＋log425＋log85)(log52＋log254＋log1258)10、log932·log6427＋log92·log427.1．82log9log3的值是2．3log43的值是3．2323223log2log3(log2log3)log3log2的值是4．若02log2logmn时，则m与n的关系是A．1mnB．1nmC．10mnD．10nm5．233351log5log15log5log3的值是A．0B．1C．5log3D．3log56．若3log124x，则x＝_____________．7．有下列五个等式，其中a0且a≠1，x0,y0①log()loglogaaaxyxy，②log()loglogaaaxyxy，③1logloglog2aaaxxyy，④logloglog()aaaxyxy，⑤22log()2(loglog)aaaxyxy将其中正确等式的代号写在横线上______________．8．化简下列各式：(1)14lg23lg5lg5(2)3lglg70lg37(3)2lg2lg5lg2019．利用对数恒等式logaNaN，求下列各式的值：(1)534log4log5log3111()()()453(2)25941loglog27log12323510．已知3log5a，57b，用a、b的代数式表示105log63=________．