已知x^n=5,y^3,求(xy)^2n和(x^2y^3)^n的值
问题描述:
已知x^n=5,y^3,求(xy)^2n和(x^2y^3)^n的值
答
(xy)^2n
=x^2n*y^2n
=(x^n)^2*(y^n)^2
=5^2*3^2
=25*9
=225
(x^2y^3)^n
=x^2n*y^3n
==(x^n)^2*(y^n)^3
=25*27
=675