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计算:(1-y)²-(1+y)(-1-y)

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p=(y1+y2-a)/2  p=a+y1-y2  p=(a+y1-y2)/2  p=(a+y2-y2)/2  
z(x+1,y)=z(x,y)+A/C  z(x+1,y)=z(x,y)-A/C  z(x+1,y)=z(x,y)+C/A  z(x+1,y)=z(x,y)-C/A  
if(x>0)y=1;   else if(x= =0)y=0;      else y=-1;  y=0;   if(x>0)y=1;  else if(x<0)y=-1;  y = 0;  if (x> = 0)     if (x>0) y = 1;  else y = -1;  if ( x > = 0)    if ( x>0)y = 1;   else y = 0;   else y = -1;  
[x-(2y+1)]2   [x-(2y-1)][x+(2y-1)]   [(x-2y)+1][(x-2y)-1]   [x+(2y-1)]2  
[x﹣(2y+1)]2  [x+(2y﹣1)][x﹣(2y﹣1)]  [(x+2y)﹣1][(x﹣2y)+1]  [x+(2y+1)]2  
if(x>0)y=1;   else if(x= =0)y=0;       else y=-1;  y=0;   if(x>0)y=1;   else if(x<0)y=-1;  y = 0;   if (x> = 0)     if (x>0) y = 1;   else y = -1;  if ( x > = 0)    if ( x>0)y = 1;    else y = 0;   else y = -1;  

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