直线y=ax(a大于0)与双曲线y=1\x交于A(x1,y1)B(x2,y2)两点,则x1y2-x2x1=_______

直线y=ax(a大于0)与双曲线y=1\x交于A(x1,y1)B(x2,y2)两点,则x1y2-x2x1=_______
直线y=ax(a大于0)与双曲线y=1\x交于A(x1,y1)B(x2,y2)两点,则x1y2-x2x1=_______

直线y=ax(a大于0)与双曲线y=1\x交于A(x1,y1)B(x2,y2)两点,则x1y2-x2x1=_______
ax=1/x,即x^2=1/a,可知x1+x2=0,代入有y1+y2=0且x1y1=1.
x1y2-x2x1=-x1y1+x1^2=-1+1/a