函数及其图像是初中数学的核心知识,是中考的重点,现以2015年中考题为例,把常考的知识点归纳如下,供你复习时参考.考点1直角坐标系与点的坐标特征例1(1)(2015年威海卷)若点A(a+1,b-2)在第二象限,则点B(-a,b+1)在().A.第一象限B.第二象限C.第三象限D.第四象限(2)(2015年南京卷)在平面直角坐标系中,点A的坐标是(2,-3),作点A关于x轴的对称 Function and its image is the core knowledge of junior high school mathematics, is the focus of the exam, is the 2015 senior high school entrance examination questions as an example, the common test knowledge points are summarized below, for your reference when reviewing. 1 Cartesian coordinate system and point coordinate characteristics Example 1 (1) (Weihai, 2015) If point A (a + 1, b-2) is in the second quadrant, then point B (-a, b + 1) is in () .A. Second quadrant C. Third quadrant D. Fourth quadrant (2) (2015 Nanjing vol.) In a Cartesian coordinate system, the coordinate of point A is (2, -3), and the symmetry of point A with respect to the x-axis