若x^3n=2,试求x^6n+x^4n乘以x^5n的值
问题描述：
若x^3n=2,试求x^6n+x^4n乘以x^5n的值
答
因为x^3n=2,
所以x^6n+(x^4n)(x^5n)
=(x^3n)^2+x^(4n+5n)=(x^3n)^2+(x^3n)^3
=2^2+2^3=12
答
x^6n+x^4n乘以x^5n
=x^6n+x^(4n+5n)
=x^6n+x^9n
=(x^3n)^2+(x^3n)^3
=2^2+2^3
=4+8
=12