Jawabanmu

2014-09-04T22:50:38+07:00
Log18=log(3x3x2)=log3+log3+log2=0,4771+0,4771+0,3010
log27=log(3x7)=log3+log7=0,4771+0,3451
log10,5=log(3x7:2)=log3+log7-log2=0,4771+0,3451-0,3010
log1/7=log(7:7x7)=log7-log7+log7=0,3451-0,3451+0,3451
2014-09-04T22:51:43+07:00
Log 21 = log 7 x log 3
log 21 = (log 7 + log 3)
log 21 = (0,3451 + 0,4771)
log 21 = 0,8222

log 18 = log 3 x log 3 x log 2
log 18 = (log 3 + log 3 + log 2)
log 18 = (0,4771 + 0,4771 + 0,3010)
log 18 = 1,2552

log 10,5 = log 21 : log 2
log 10,5 = (log 21 - log 2)
log 10,5 = (0,8222 - 0,3010)
log 10,5 = 0,5212

log 1/7 = log 7pangkat-1
log 1/7 = -(log 7)
log 1/7 = -0,3451