4√27是指四次根号下27吧:log3×[(4在上面)4√27/3]+lg25+lg4+[7^(log7^2)]=log3((3^(3/4))/3)+lg(25*4)+2=log3(3^(-1/4))+2+2= -1/4+4=15/4
解:log3 4√27/3+lg25+lg4+7^log7 2=log3 4+log3 √3+lg100+2=2log3 2 9/2+