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ingat bahwa log axb= loga +log b
= log 2 +log3+log2+log3+log2
= 10+20+10+20+10
= 70
log (axb) = log a + log b
sehingga
log 72 = log (2x2x2x3x3)
log 72 = log 2 + log 2 + log 2 + log 3 + log 3
log 3= 20
log 2 = 10
jadi
log 72 = log 2 + log 2 + log 2 + log 3 + log 3
log 72 = 10 + 10 + 10 + 20 + 20
log 72 = 70