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能够正确地确定点的坐标是学好平面直角坐标系的基础,解决这类问题的关键是掌握确定点的坐标的方法,下面举例说明,供同学们参考.一、由点的坐标确定点所在的象限例1(2010年金华)在平面直角坐标系中,点P(-1,3)位于().A.第一象限B.第二象限C.第三象限D.第四象限解析:根据平面直角坐标系中各象限内点的坐标特征可知,点P(-1,3)在第二象限.应选B.点译:解这类题的关键是熟记各象限内点
To correctly determine the coordinates of the point is to learn the basis of a flat rectangular coordinate system, the key to solve this problem is to master the method of determining the coordinates of the point, the following examples for the students reference. First, the coordinates of the point to determine the point Quadrant 1 (2010 Jinhua) In the Cartesian coordinate system, the point P (-1,3) is located at () .A. The first quadrant B. The second quadrant C. The third quadrant D. The fourth quadrant Analysis: According to Plane Cartesian coordinate system within the quadrant of the coordinates of the point of view we can see that the point P (-1,3) in the second quadrant. Should be selected B. Point translation: Solution The key is to memorize each quadrant within the point