精品偷拍一区二区三区,亚洲精品永久 码,亚洲综合日韩精品欧美国产,亚洲国产日韩a在线亚洲

  • <center id="usuqs"></center>
  • 
    
  • 如果將點(diǎn)P繞定點(diǎn)M旋轉(zhuǎn)180°后與點(diǎn)Q重合,那么稱(chēng)點(diǎn)P與點(diǎn)Q關(guān)于點(diǎn)M對(duì)稱(chēng),定點(diǎn)M叫做對(duì)稱(chēng)中心.此時(shí),點(diǎn)M是線段PQ的中點(diǎn).在平面直角坐標(biāo)系中,△ABO的頂點(diǎn)A,B,O的坐標(biāo)分別為(1,0)、(0,1)

    如果將點(diǎn)P繞定點(diǎn)M旋轉(zhuǎn)180°后與點(diǎn)Q重合,那么稱(chēng)點(diǎn)P與點(diǎn)Q關(guān)于點(diǎn)M對(duì)稱(chēng),定點(diǎn)M叫做對(duì)稱(chēng)中心.此時(shí),點(diǎn)M是線段PQ的中點(diǎn).在平面直角坐標(biāo)系中,△ABO的頂點(diǎn)A,B,O的坐標(biāo)分別為(1,0)、(0,1)、(0,0).點(diǎn)列P1、P2、P3、…,中的相鄰兩點(diǎn)都關(guān)于△ABO的一個(gè)頂點(diǎn)對(duì)稱(chēng):點(diǎn)P1與點(diǎn)P2關(guān)于點(diǎn)A對(duì)稱(chēng),點(diǎn)P2與點(diǎn)P3關(guān)于點(diǎn)B對(duì)稱(chēng),點(diǎn)P3與點(diǎn)P4關(guān)于點(diǎn)O對(duì)稱(chēng),點(diǎn)P4與點(diǎn)P5關(guān)于點(diǎn)A對(duì)稱(chēng),點(diǎn)P5與點(diǎn)P6關(guān)于點(diǎn)B對(duì)稱(chēng),點(diǎn)P6與點(diǎn)P7關(guān)于點(diǎn)O對(duì)稱(chēng),…,對(duì)稱(chēng)中心分別是A,B,O,A,B,O,…,且這些對(duì)稱(chēng)中心依次循環(huán).已知點(diǎn)P1的坐標(biāo)是(1,1),則點(diǎn)P2012的坐標(biāo)為( ?。?br/> A. (1,1)
    B. (-1,3)
    C. (1,-1)
    D. (1,3)
    數(shù)學(xué)人氣:120 ℃時(shí)間:2020-06-25 05:41:43
    優(yōu)質(zhì)解答
    ∵點(diǎn)P1(1,1)關(guān)于點(diǎn)A的對(duì)稱(chēng)點(diǎn)是P2(1,-1),點(diǎn)P2關(guān)于點(diǎn)B的對(duì)稱(chēng)點(diǎn)是P3(-1,3),點(diǎn)P3關(guān)于點(diǎn)O的對(duì)稱(chēng)點(diǎn)P4(1,-3),點(diǎn)P4關(guān)于點(diǎn)A的對(duì)稱(chēng)點(diǎn)P5(1,3),點(diǎn)P5關(guān)于點(diǎn)B的對(duì)稱(chēng)點(diǎn)是P6(-1,-1),點(diǎn)P6關(guān)于點(diǎn)O的對(duì)稱(chēng)點(diǎn)是P7...
    我來(lái)回答
    類(lèi)似推薦
    請(qǐng)使用1024x768 IE6.0或更高版本瀏覽器瀏覽本站點(diǎn),以保證最佳閱讀效果。本頁(yè)提供作業(yè)小助手,一起搜作業(yè)以及作業(yè)好幫手最新版!
    版權(quán)所有 CopyRight © 2012-2024 作業(yè)小助手 All Rights Reserved. 手機(jī)版