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a) log 18 = log 2 x 3²
= log 2 + log 3²
= log 2 + 2 .log 3
= 0,3010 + 2 . 0,4771
= 0,3010 + 0,9542
= 1,2552
b) log 21 = log 3 x 7
= log 3 + log 7
= 0,4771 + 0,8451
= 1,3222
c) log 10,5 = log 21 : 2
= log 21 - log 2
= 1,3222 - 0,3010
= 1,0212
d) log = log 1 - log 7
= 0 - 0,8451
= - 0,8451