已知x^m=3,x^n=6,则x^3m - 2n=____

问题描述:

已知x^m=3,x^n=6,则x^3m - 2n=____

x^﹙3m - 2n﹚=x^3m÷x^2n
=﹙x^m﹚³÷﹙x^n﹚²
=3³÷6²