Chemistry
Senior High
なぜ、このような式ができるのですか…？
詳しい説明お願いします！
log2=03 とすると.
logt2X10 ?) =log2+log10.?
=log2-3]og10
1082二3選=2
log4=log22=2log2=0.6
log5=log =log10-log2=07
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なぜ、log2=0.3とするとlog（2×10-³）なるのか、
そして、log（2×10-³）のあとの式の展開もよくわかりません…