1.若$y=-\frac{1}{x}$图象与y=-x2+bx图象有且仅有2个不同的公共点A(x1,y1),B(x2,y2),则下列判断正确的是( )
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| A. | x1+x2>0,y1+y2>0 | B. | x1+x2>0,y1+y2<0 | C. | x1+x2<0,y1+y2>0 | D. | x1+x2<0,y1+y2<0 |