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⁶log 4 = p --> ⁴log 6 = 1/p
³ log 4 = q --> ⁴loh 3 = 1/q
⁴log 18 = ⁴log 6 + ⁴log 3 = 1/p + 1/q = (p+q)/(p q)
12)
2 . ( log 0,04 + log 0,25)=
= 2(log (0,04 x 0,25)
= 2(log 0,01)
= 2 log 10⁻²
= 2 ( -2 log 10)
= 2 (-2)(1)
= -4