已知x的m次方=5的,x的n次方=3求x的2m-3n次方

问题描述:

已知x的m次方=5的,x的n次方=3求x的2m-3n次方

x^(2m-3n)
=x^2m÷x^3n
=(x^m)^2÷(x^n)^3
=5^2÷3^3
=25/27