點(diǎn)A的坐標(biāo)是(-6,8),則點(diǎn)A關(guān)于x軸對稱的點(diǎn)的坐標(biāo)是________,點(diǎn)A關(guān)于y軸對稱的點(diǎn)的坐標(biāo)是________,點(diǎn)A關(guān)于原點(diǎn)對稱的點(diǎn)的坐標(biāo)是________.
(-6,-8) (6,8) (6,-8)
分析:根據(jù)在平面直角坐標(biāo)系中,點(diǎn)關(guān)于x軸對稱時,橫坐標(biāo)不變,縱坐標(biāo)為相反數(shù),關(guān)于y軸對稱時,橫坐標(biāo)為相反數(shù),縱坐標(biāo)不變,關(guān)于原點(diǎn)對稱時,橫縱坐標(biāo)都為相反數(shù),即可解答本題.
解答:∵在平面直角坐標(biāo)系中,點(diǎn)關(guān)于x軸對稱時,橫坐標(biāo)不變,縱坐標(biāo)為相反數(shù),
∴點(diǎn)A關(guān)于x軸對稱的點(diǎn)的坐標(biāo)是(-6,8),
∵關(guān)于y軸對稱時,橫坐標(biāo)為相反數(shù),縱坐標(biāo)不變,
∴點(diǎn)A關(guān)于y軸對稱的點(diǎn)的坐標(biāo)是(6,8),
∵關(guān)于原點(diǎn)對稱時,橫縱坐標(biāo)都為相反數(shù),
∴點(diǎn)A關(guān)于原點(diǎn)對稱的點(diǎn)的坐標(biāo)是(6,-8),
故答案為(-6,8),(6,8),(6,-8).
點(diǎn)評:本題考查了在平面直角坐標(biāo)系中,點(diǎn)關(guān)于x軸,y軸及原點(diǎn)對稱時橫縱坐標(biāo)的符號,難度適中.