若x^2n=4,则x^6n=?若x^3k=5,y^2k=3,则x^6k*y^4k=?
问题描述:
若x^2n=4,则x^6n=?若x^3k=5,y^2k=3,则x^6k*y^4k=?
若x^2n=4,则x^6n=?
若x^3k=5,y^2k=3,则x^6k*y^4k=?
答
x^6n
=x^(2n*3)
=(x^2n)^3
=4^3
=64
x^6k*y^4k
=x^(3k*2)*y^(2k*2)
=(x^3k)^2*(y^2k)^2
=5^2*3^2
=225