已知n为正整数,且x^2n=7,求(3x^3n)²-4(x²)^2n

问题描述:

已知n为正整数,且x^2n=7,求(3x^3n)²-4(x²)^2n

(3x^3n)²-4(x²)^2n
=9x^6n-4x^4n
=9(X^2n)^3-4(x^2n)^2的值...值还要我算啊?9 7^34 7^263-4 5959 49 60-150-13000-50-60+1=28892889