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熟悉各象限内点的坐标特征是进一步学习函数的基础,同学们必须要加以重视.同时,点的坐标又是每年中考的热点之一,现将一些中考试题分类整理如下,供同学们学习时参考.一、考查点的位置例1(2011年山西)点(-2,1)所在的象限是().A.第一象限B.第二象限C.第三象限D.第四象限解析:x_0>0,y_0>00,则点(x_0,y_0)在第一象限;x_0<0,y_0>0,则点(x_0,y_0)在第二象限;x_0<0,y_0<0,则点(x_0,y_0)在第三象限;x_0>0,y_0<0,则点(x_0,y_0)
Familiar with the coordinate features of each quadrant within the point is the basis for further learning functions, students must pay attention to. At the same time, the coordinates of points is one of the hottest mid-term examinations, now some senior high school entrance examination questions are organized as follows for students to learn First, the location of the test point Example 1 (Shanxi Province in 2011) point (-2,1) where the quadrant is (.) A. The first quadrant B. The second quadrant C. The third quadrant D. The fourth quadrant analysis (x_0, y_0) in the second quadrant; x_0 <0, y_0 <0, then the point (x_0, y_0) is in the first quadrant; x_0 <0, y_0> 0, then the point Point (x_0, y_0) is in the third quadrant; when x_0> 0 and y_0 <0, the point (x_0, y_0)