3、常用的對(duì)稱點(diǎn):點(diǎn)(a,b)關(guān)于x軸的對(duì)稱點(diǎn)(a,-b),關(guān)于y軸的對(duì)稱點(diǎn)為(-a,b),關(guān)于原點(diǎn)的對(duì)稱點(diǎn)(-a,-b)關(guān)于直線y=x的對(duì)稱點(diǎn)為(b,a),關(guān)于直線y=-x的對(duì)稱點(diǎn)(-b,-a),關(guān)于直線y=x+m的對(duì)稱點(diǎn)為(b-m,a+m),關(guān)于直線y=-x+m