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= ^3log 10 + ^3log 3 + ^3log 5 - ^3log 10 - ^3log 3
= ^3log 5 = b
b) ^2 log 3 * ^3 log 5
^2 log 5 = a*b
c) log (5/100) = ^2 log 5 - ^2log 100
= ab - 2 * ^2 log 10
= ab - 2* ^2 log (5x2)
= ab - 2* (^2 log 5 + ^2 log 2)
= ab - 2* (ab + 1)
= ab - 2ab - 2
= -ab - 2