lg(1/2)-lg(5/8)+lg12.5-log8^9×log3^4要过程

问题描述:

lg(1/2)-lg(5/8)+lg12.5-log8^9×log3^4要过程

lg(1/2)-lg(5/8)+lg12.5-log8^9×log3^4
=lg(1/2÷5/8×12.5)-lg9/lg8×lg4/lg3
=lg10-2lg3/3lg2 ×2lg2/lg3
=1-2/3×2
=-1/3