由题意知1+x≥0,1-y≥0∴y-1≤0∴ 1+x ?(y?1) 1?y =0可化为 1+x + (1?y)3 =0又1+x≥0,1-y≥0∴1+x=0,1-y=0∴x=-1,y=1∴x2011-y2011=(-1)2011-12011=-1-1=-2故答案为:-2