lg14减2lg7/3+lg7-lg18

来源：学生作业帮助网编辑：作业帮时间：2024/05/07 06:28:15

lg14减2lg7/3+lg7-lg18
lg14减2lg7/3+lg7-lg18

lg14减2lg7/3+lg7-lg18
lg14-2lg7/3+lg7-lg18
=LG(14*7/((7/3)^2*18)
=LG(14*7*9/(7*7*18))=LG1=0

lg14-2lg7/3+lg7-lg18
=(lg2+lg7)-2(lg7-lg3)+lg7-(lg9+lg2)
=2lg3-lg9
=lg3²-lg9
=lg9-lg9
=0