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计算:(y>0).

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y=-x,y=0,y=x2   y=-x,y=x2,y=0   y=0,y=x2,y=-x   y=0,y=-x,y=x2  
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;  
y=sqrt(x);  if(x<0)y=sqrt(-x);  if(x>0)y=sqrt(x);  else y=sqrt(-x);  if(x>=0)y=sqrt(x);  if(x<0)y=sqrt(-x);  y=sqrt(x>=0x:-x);  
if(x>=0) y=sqrt(x);  else y=sqrt(-x);  y=sqrt(x);  if(x<0) y=sqrt(-x);  if(x>=0) y=sqrt(x);  if(x<0) =sqdrt(-x);  y=sqrt(x>=0x:-x);  
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;  
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;  
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;  
if(x>=0 y=sqrt(; else y=sqrt(-;  y=sqrt( if(x<0)y=sqrt(-;  if(x>=0) y=sqrt(; if(x<0)y=sqrt(-;  y=sqrt(x>=0x:-;  
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;  
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;  
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;  
y=-x,y=0,y=x2  y=-x,y=x2,y=0   y=0,y=x2,y=-x  y=0,y=-x,y=x2  
y=-x,y=0,y=x2   y=-x,y=x2,y=0   y=0,y=x2,y=-x   y=0,y=-x,y=x2http://w ww .xkb1. com  
if(x>=0) y=sqrt(; else y=sqrt(-;  y=sqrt(; if(x<0) y=sqrt(-;  if(x>=0) y=sqrt(; if(x<0) =sqdrt(-;  y=sqrt(x>=0x:-;  

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