已知x+2y=2,求9的x次方*81的y次方的值

问题描述:

已知x+2y=2,求9的x次方*81的y次方的值
please!

9^x*81^y
=9^x*(9*9)^y
=9^x*9^2y
=9^(x+2y)
=9^2
=81