问题标题：
若5^m=225^n=3,求5^2m-4n+3的值~
问题描述：
若5^m=225^n=3,求5^2m-4n+3的值~
崔立彦回答：
5^2m-4n+3
=(5^m)^2÷(5^2)^2n×5^3
=(5^m)^2÷(25^n)^2×5^3
=2^2÷3^2×125
=500/9
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