发布日期:2010-04-09 06:27:16
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①坐标平面内的点与有序实数对一一对应; ②点P(a,b)到x轴的距离为│b│,到y轴距离为│a│,到原点距离为 ③各象限内点的坐标的符号特征:P(a,b),P在第一象限 P在第二象限 ④点P(a,b):若点P在x轴上 P在y轴上 P在二,四象限坐标轴夹角平分线上 ⑤A(x1,y1),B(x1,y2):A,B关于x轴对称 A、B关于的y轴对称 A,B关于原点对称 AB∥y轴 |