若x的2n次方=3,则(x的3n次方)²=?
问题描述:
若x的2n次方=3,则(x的3n次方)²=?
答
∵x^(2n)=3
∴[x^(3n)]^2=x^(6n)
=[x^(2n)]^3
=3^3
=27