log2 16 - log8 64
log7 5 * log25 16 * log4 7
2log5 15 - log5 25 + log5 35
lg 216 / lg6
log4 log3 81
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log2 16 - log8 64
log7 5 * log25 16 * log4 7
2log5 15 - log5 25 + log5 35
lg 216 / lg6
log4 log3 81
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Answers & Comments
log7 5 * log25 16 * log4 7= log4 5 *log4 7 = 0,5
2log4 7*log4 5
2log5 15 - log5 25 + log5 35=2log5(15:25*35)=2log5 21
lg 216 / lg6=lg (216-6)=lg 200=2lg 20
log4(log3 81)=log4 4=1