∵ 36 =x,∴x=6,∵ y =3,∴y=9,又∵z是16的平方根,∴z=±4,当x=6,y=9,z=4时,2x+y-5z=2×6+9-5×4=12+9-20=1.当x=6,y=9,z=-4时,2x+y-5z=2×6+9-5×(-4)=12+9+20=41.