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）a＞c＞b （ ） b＞c＞a （ ）c＞b＞a （ ）c＞a＞b
logab·logcb＝logca logab·logca＝logcb loga(bc)＝logab·logac loga(b＋c)＝logab＋logac
log0.52.7>log0.52.8 log34>log65 log34>log56 logπe>logeπ
xa>xb logxa>logxb logax>logbx
log32＜log23＜log25 log32＜log25＜log23 log23＜log32＜log25 log23＜log25＜log32
log20.8＜0.993.3＜log3π log20.8＜log3π＜0.993.3 0.993.3＜log20.81＜log3π log3π＜0.993.3＜log20.8
log20.9＜0.90.3＜log3π log20.9＜log3π＜0.90.3 0.90.3＜log20.9＜log3π log3π＜log20.9＜0.90.3
loga(logax)ax2<(logax)2 loga(logax)< (logax)2< logax2 logax2a(logax)< (logax)2 (logax)2ax2a(logax)
log23.424.3 log67>log76 log0.23>log0.33 log3π0.3π
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