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平面直角坐标系是数轴由一维到二维的过渡,同时它又是学习函数的基础,另外,平面直角坐标系将平面内的点与数结合起来,体现数形结合的思想,现结合中考试题举例说明,供同学们参考.一、平面直角坐标系中点的特征例1(2014·山东威海)已知点P(3-m,m-1)在第二象限,则m的取值范围在数轴上表示正确的是().【分析】根据第二象限内点的坐标的特点,可得不等式,解不等式,可得答案.解:已知点P(3-m,m-1)在第二象限,
The plane rectangular coordinate system is the transition from the one-dimensional to the two-dimensional of several axes. At the same time, it is the basis of the learning function. In addition, the plane rectangular coordinate system combines the points and numbers in the plane to reflect the idea of combination of numbers and shapes. Questions for example, for students to refer to. First, the characteristics of the midpoint of the plane rectangular coordinate system Example 1 (2014 Weihai, Shandong) Known point P (3-m, m-1) in the second quadrant, the value of m The range on the axis is the correct one (). [analysis] According to the characteristics of the coordinates of the point in the second quadrant, inequality can be obtained, solution inequality, available answers. Solution: known point P (3-m, m-1 ) In the second quadrant,