已知(x-15)2=169,(y-1)3=-0.125,求x−2xy−32y−x的值.
问题描述:
已知(x-15)2=169,(y-1)3=-0.125,求
−
x
−
2xy
的值.
3
2y−x
答
∵(x-15)2=169,(y-1)3=-0.125,∴x-15=±13,y-1=-0.5,∴x=28或x=2,y=0.5,当x=28,y=0.5时,原式=28-2×28×0.5-32×0.5-28=27-27+3=3;当x=2,y=0.5时,原式=2-2×2×0.5-32×0.5-2=2-2+1=1....