x+5y+2=0,则4^2x+y*8^y-x
问题描述：
x+5y+2=0,则4^2x+y*8^y-x
答
∵x+5y+2=0
∴x+5y=-2
4^2x+y*8^y-x
=2^(4x+2y)×2^(3y-3x)
=2^(x+5y)
=2^(-2)
=1/4