1+1=2 [对D]
1-1=0 [错D]
1-1=1-1=0 [对D]
1-1=0 [错D.只是希望和梦想]
1-1=1-1-1=-1 [对D]
1-1=-1[对 D.现实和地狱]
1-1-1=-1=mxysas[我D]