log3（這個(gè)3是對(duì)數(shù)的底數(shù)）根號(hào)27+lg25+lg4
=0.5log3（這個(gè)3是對(duì)數(shù)的底數(shù)）27+lg25+lg4
=1.5log3（這個(gè)3是對(duì)數(shù)的底數(shù)）3+lg25+lg4
=1.5+lg25+lg4
=1.5+lg100
=1.5+2
=3.5沒(méi)看懂= =哪步?jīng)]有看懂？=0.5log3（這個(gè)3是對(duì)數(shù)的底數(shù)）27+lg25+lg4log3（這個(gè)3是對(duì)數(shù)的底數(shù)）根號(hào)27+lg25+lg4 =log3（這個(gè)3是對(duì)數(shù)的底數(shù)）(27的0.5次方)+lg25+lg4=0.5log3（這個(gè)3是對(duì)數(shù)的底數(shù)）27+lg25+lg4