(4)的log2(底数）3（对数）次幂
= [2的log2(底数）3（对数）次幂] ^2
= 3^2
= 9
(lg5)的平方+lg2乘以lg5+(4)的log2(底数）3（对数）次幂
= lg5(lg5+lg2) + 9
= lg5 + 9