- snjk
-
首先:lg8=3lg2,log2(5)=lg5/lg2,log5(4)=lg4/lg5=2lg2/lg5
所以,lg8*log2(5)*log5(4)=3lg2 X lg5/lg2 X 2lg2/lg5=6lg5
- 皮皮
-
=lg8*(lg5/lg2)*lg4/lg5
=(lg8)*2
=(3lg2)*2
=6lg2
首先:lg8=3lg2,log2(5)=lg5/lg2,log5(4)=lg4/lg5=2lg2/lg5
所以,lg8*log2(5)*log5(4)=3lg2 X lg5/lg2 X 2lg2/lg5=6lg5
=lg8*(lg5/lg2)*lg4/lg5
=(lg8)*2
=(3lg2)*2
=6lg2