lg14减2lg7/3+lg7-lg18
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 23:25:07
![lg14减2lg7/3+lg7-lg18](/uploads/image/z/14098811-59-1.jpg?t=lg14%E5%87%8F2lg7%2F3%2Blg7-lg18)
x)I74yono
$u"6IEl&aaheӌ32DѲ0R@qM~qAbV09F !M]#
&X g dAj6JZBx@5% Xo
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