log2(1/25)*log3(1/8)*log5(1/9)
=lg(1/25)/lg2 * lg(1/8)/lg3 * lg(1/9)/lg5
=(-2)lg5/lg2 * (-3)lg2/lg3 * (-2)lg3/lg5
=-12
[log4(3)+log8(3)]*[log3(2)+log9(2)]-(1/4)log(1/2)32]
=[lg3/(2lg2)+lg3/(3lg2)]*[lg2/lg3+lg2/(2lg3)]-(1/4)*(-5)log(1/2)(1/2)
=5lg3/(6lg2) * 3lg2/(2lg3) +5/4
=5/2