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b.¹⁵log 405 = ¹⁵ log (5 x 3⁴) = ¹⁵ log 5 + ¹⁵log 3⁴ =(log5)/(log15) + (4log3)/log15 =
q/(p+q) + 4p/(p+q) = (q + 4p)/(p +q)
c. ⁹log 0,008 = ⁹log(1/125) = ⁹log(1/5³) = ⁹log 5⁻³ = -3log5 /2log3 =-3q/2p
d. ⁴⁵log 1875 = ⁴⁵log (3 x 625) = ⁴⁵ log (3 x 5⁴) =⁴⁵ log3 + 4 ⁴⁵log5 = p/(2p + q) + 4 x q/(2p +q)