已知(x^3n-2)^2·x^2n+4÷x^n=x^2n-5,求n的值
问题描述:
已知(x^3n-2)^2·x^2n+4÷x^n=x^2n-5,求n的值
答
(x^3n-2)^2·x^2n+4÷x^n=x^2n-5
x^9n^2+2n/x^n=x^2n-5
x^9n+2=x^2n-5
9n+2=2n-5
7n=-7
n=-1