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mapel : matematika
kategori : logaritma
kata kunci : uji kompetensi 1.3 logaritma
Pembahasan :
buku matematika BSE bab 1 uji kompetensi 1.3 tentang logaritma
no 4) diketahui log 2 = 0,3010
log 3 = 0,4771
log 7 = 0.8451
ditanya
a) log 18
b) log 21
c) log 10,5
d) log 1/7
jawab :
a) log 18 = log (2x3^2)
= log 2 + 2 log 3
= 0,3010 + 2 . 0,4771
= 0,3010 + 0,9542
= 1,2552
b) log 21 = log (3x7)
= log 3 + log 7
= 0,4771 + 0,8451
= 1,3222
c) log 10,5 = log (3x7/2)
= log 3 + log 7 - log 2
= 0,4771 + 0,8451 - 0,3010
= 1,3222 - 0,3010
= 1,0212
d) log 1/7 = log 7^-1
= -1 . log 7
= -1 . 0,8451
= -0,8451