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b) log 21
c) log 10,5
d) log 1/7
Ket : log 1 = 0
= 2log3 + log 2
= 2.0,4771 + 0,3010
= 0,9542 + 0,3010
= 1,2552
log 27 = log 3.7
= log3 + log7
= 0.4771 + 0.8451
= 1,3222
log 10.5 = log 21/2
= log 3 + log 7 - log 2
= 1.3222 - 0,3010
= 1,0212
log 1/7 = log 1 - log7
= 0 - 0,8451
= -0,8451