Question

(2003廣東)與點(diǎn)P(3，－4)關(guān)于y軸對(duì)稱的點(diǎn)的坐標(biāo)為（_____，___）；與點(diǎn)Q(－3，4)關(guān)于原點(diǎn)對(duì)稱的點(diǎn)的坐標(biāo)為（____，____）．

Answer 1

答案：-3,-4;3,-4
解析：

解　縱坐標(biāo)不變，橫坐標(biāo)乘以－1，圖形關(guān)于y軸對(duì)稱；橫坐標(biāo)、縱坐標(biāo)均乘以－1，圖形關(guān)于原點(diǎn)對(duì)稱．所以點(diǎn)P(3，－4)關(guān)于y軸對(duì)稱點(diǎn)的坐標(biāo)為(－3，－4)；與點(diǎn)Q(－3，4)關(guān)于原點(diǎn)對(duì)稱的點(diǎn)的坐標(biāo)為(3，－4)．