在平面直角坐標(biāo)系xOy中,已知點(diǎn)M(a,b),將經(jīng)過(guò)點(diǎn)(a,0)垂直于x軸的直線記為直線x=a,將經(jīng)過(guò)點(diǎn)(0,b)且垂直于y軸的直線記為直線y=b.對(duì)于點(diǎn)P給出如下定義:將點(diǎn)P關(guān)于直線x=a對(duì)稱(chēng)得到點(diǎn)P1,則稱(chēng)點(diǎn)P1為點(diǎn)P關(guān)于直線x=a的“一次對(duì)應(yīng)點(diǎn)”,再將點(diǎn)P1關(guān)于直線y=b對(duì)稱(chēng)得到點(diǎn)Q,稱(chēng)點(diǎn)Q為點(diǎn)P關(guān)于M的“二次對(duì)應(yīng)點(diǎn)”.
已知△ABC頂點(diǎn)坐標(biāo)為A(2,0),B(4,0),C(3,-3).
(1)如圖1,若點(diǎn)M(1,1).
①將點(diǎn)A(2,0)關(guān)于直線x=1對(duì)稱(chēng)得到點(diǎn)(0,0),再將點(diǎn)(0,0)關(guān)于直線y=1對(duì)稱(chēng)得到點(diǎn)(0,2),則點(diǎn)A(2,0)關(guān)于點(diǎn)M“二次對(duì)應(yīng)點(diǎn)”為(0,2).請(qǐng)直接寫(xiě)出點(diǎn)B(4,0)關(guān)于直線x=1的“一次對(duì)應(yīng)點(diǎn)”; (-2,2)(-2,2);點(diǎn)C(3,-3)關(guān)于點(diǎn)M的“二次對(duì)應(yīng)點(diǎn)”:(-1,5)(-1,5);
②若點(diǎn)P1(-1,n)和點(diǎn)P2(-1,n+1)關(guān)于x=1的“一次對(duì)應(yīng)點(diǎn)”分別為點(diǎn)Q1和點(diǎn)Q2,且線段Q1Q2與△ABC的邊沒(méi)有公共點(diǎn),求n的取值范圍;
(2)若點(diǎn)B關(guān)于點(diǎn)M的“二次對(duì)應(yīng)點(diǎn)”為點(diǎn)Q3,且以A、B、Q3為頂點(diǎn)的三角形恰與△AOC全等,請(qǐng)直接寫(xiě)出所有滿足條件的點(diǎn)M的坐標(biāo):(52,32)或(52,-32)或(92,32)或(92,-32)(52,32)或(52,-32)或(92,32)或(92,-32).
5
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【考點(diǎn)】幾何變換綜合題.
【答案】(-2,2);(-1,5);(,)或(,-)或(,)或(,-)
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【解答】
【點(diǎn)評(píng)】
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發(fā)布:2024/10/17 7:0:2組卷:82引用:1難度:0.3
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