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log 18 = log 2 . log 3 . log 3
log 18 = 0,3010 + 0,4771 + 0,4771
log 18 = 1,2552
b.
log 21 = log 3 . log 7
log 21 = 0,4771 + 0,8451
log 21 = 1,3222
c.
log 10,5 = log 3 . log 7 / log 2
log 10,5 = 0,4771 + 0,8451 - 0,3010
log 10,5 = 0,0212
d.
log 1/7 = log 7^-1
log 1/7 = 0,8451^-1
log 1/7 = 1/0,8451