指数对数练习篇 =327log643log928计算: 5()4log5l88422123344()()ab 213(6)ab0.752310.586652352aa58321)(x)41(32341baba52log3l771log0l31log452log3l218180431lg25l 3log8l9146log43l2l 2327323 )()4()( abab 61log3llog55531232)7()1(5 41log3l2log666231lg25lg0.1lo9lglog2(log3(log464) 6321loglg 142lg lg 7lg 18(lg5) 2(lg2) 2 2lg5lg273lg8log25log54 8log6l32log4225.0315.06)27().( 4325110lg37l0lg522lo3lg64552log10l.24log135log4l85827l9log3设 _lg52,xx则若 _31log(),9x则已知 _2l()1,x则已知 ,则 x=_;若 ,则2log16x 16log2xx=_