點(diǎn)A(-3,2)關(guān)于x軸的對(duì)稱點(diǎn)A1的坐標(biāo)是 ,點(diǎn)A關(guān)于原點(diǎn)的對(duì)稱點(diǎn)A2的坐標(biāo)是 .
【答案】分析:讓橫坐標(biāo)不變,縱坐標(biāo)互為相反數(shù)可得點(diǎn)A關(guān)于x軸的對(duì)稱點(diǎn)A1的坐標(biāo);
讓橫縱坐標(biāo)均互為相反數(shù)可得點(diǎn)A關(guān)于原點(diǎn)的對(duì)稱點(diǎn)A2的坐標(biāo).
解答:解:∵2的相反數(shù)是-2,
∴點(diǎn)A(-3,2)關(guān)于x軸的對(duì)稱點(diǎn)A1的坐標(biāo)是 (-3,-2);
∵-3的相反數(shù)為3,
∴點(diǎn)A關(guān)于原點(diǎn)的對(duì)稱點(diǎn)A2的坐標(biāo)是(3,-2),
故答案為(-3,-2);(3,-2).
點(diǎn)評(píng):考查兩點(diǎn)關(guān)于x軸,原點(diǎn)對(duì)稱的坐標(biāo)的特點(diǎn):兩點(diǎn)關(guān)于x軸對(duì)稱,橫坐標(biāo)不變,縱坐標(biāo)互為相反數(shù);兩點(diǎn)關(guān)于原點(diǎn)對(duì)稱,兩點(diǎn)的橫坐標(biāo)互為相反數(shù),縱坐標(biāo)互為相反數(shù).