高考试题凝结了众多高考专家智慧的结晶,体现了高考命题理念.对一些高考典型试题深入探究、拓展,有助于发挥高考试题的导向和辐射作用,提高复习效率.题目(2012山东高考题)设函数f(x)=1x,g(x)=-x2+bx.若y=f(x)的图象与y=g(x)的图象有且仅有两个不同的公共点A(x1,y1),B(x2,y2),则下列判断正确的是 College entrance examination examinations condensation of many experts crystallization of wisdom, reflects the college entrance examination propositions. Some of the typical entrance examination of the typical questions in-depth exploration, expansion, help to play the role of college entrance examination papers and radiation effects, improve the efficiency of the review. Let the function f (x) be 1x, g (x) = - x2 + bx. If the image of y = f (x) and the image of y = g (x) have only two different common points A (x1, y1), B (x2, y2), the following judgment is correct