已知n为正整数,且x的2n次方=3,求(2x的3n次方)的平方-3(x的2次方)的2n次方的值

问题描述:

已知n为正整数,且x的2n次方=3,求(2x的3n次方)的平方-3(x的2次方)的2n次方的值

(2x的3n次方)的平方-3(x的2次方)的2n次方
=(4x的6n次方)-3(x的4n次方)
=4*(x的2n次方)³-3(x的2n次方)²
=4*3³-3*3²
=3³*(4-1)
=3³*3
=81