㏒10√45=1/2㏒10(45)=1/2[㏒10(5)+2㏒10(3)]==1/2[1-㏒10(2)+2㏒10(3)]= =1/2-1/2㏒10(2)+㏒10(3)=1/2-1/2(0.3010)+0.441=0.8266
