點(diǎn)P(-3,3)關(guān)于原點(diǎn)對(duì)稱的點(diǎn)的坐標(biāo)是( )
A.(-3,-3)
B.(-3,3)
C.(3,3)
D.(3,-3)
【答案】分析:本題考查平面直角坐標(biāo)系中兩個(gè)關(guān)于坐標(biāo)軸成軸對(duì)稱的點(diǎn)的坐標(biāo)特點(diǎn).
解答:解:根據(jù)“關(guān)于原點(diǎn)對(duì)稱的點(diǎn),橫坐標(biāo)與縱坐標(biāo)都互為相反數(shù)”可知:點(diǎn)P(-3,3)關(guān)于原點(diǎn)對(duì)稱的點(diǎn)的坐標(biāo)是(3,-3).故選D.
點(diǎn)評(píng):解決本題的關(guān)鍵是掌握好對(duì)稱點(diǎn)的坐標(biāo)規(guī)律:
(1)關(guān)于x軸對(duì)稱的點(diǎn),橫坐標(biāo)相同,縱坐標(biāo)互為相反數(shù);
(2)關(guān)于y軸對(duì)稱的點(diǎn),縱坐標(biāo)相同,橫坐標(biāo)互為相反數(shù);
(3)關(guān)于原點(diǎn)對(duì)稱的點(diǎn),橫坐標(biāo)與縱坐標(biāo)都互為相反數(shù).
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