已知:3^m=5,3^n=2,求:3^2m-3n+1的值

问题描述:

已知:3^m=5,3^n=2,求:3^2m-3n+1的值

3^2m-3n+1
=3^2m×3^(-3n)×3
=﹙3^m﹚²×1/﹙3^n﹚³×3
=5²×1/2³×3
=75/8