已知n为正整数,且x^2n=5,求3(x^n)^2+2(x^3n)^2+35的值
问题描述：
已知n为正整数,且x^2n=5,求3(x^n)^2+2(x^3n)^2+35的值
答
3(x^n)^2+2(x^3n)^2+35
=3(x^2n)+2(x^2n)^3+35
=3*5+2*5^3+35
=15+250+35
=300