來(lái)源:網(wǎng)絡(luò)資源 2022-09-07 13:51:54
關(guān)于x軸、y軸或原點(diǎn)對(duì)稱(chēng)的點(diǎn)的坐標(biāo)的特征
點(diǎn)P與點(diǎn)p’關(guān)于x軸對(duì)稱(chēng),橫坐標(biāo)相等,縱坐標(biāo)互為相反數(shù),即點(diǎn)P(x,y)關(guān)于x軸的對(duì)稱(chēng)點(diǎn)為P’(x,-y)
點(diǎn)P與點(diǎn)p’關(guān)于y軸對(duì)稱(chēng),縱坐標(biāo)相等,橫坐標(biāo)互為相反數(shù),即點(diǎn)P(x,y)關(guān)于y軸的對(duì)稱(chēng)點(diǎn)為P’(-x,y)
點(diǎn)P與點(diǎn)p’關(guān)于原點(diǎn)對(duì)稱(chēng),橫、縱坐標(biāo)均互為相反數(shù),即點(diǎn)P(x,y)關(guān)于原點(diǎn)的對(duì)稱(chēng)點(diǎn)為P’(-x,-y)
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