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(1) 空间直角坐标系的定义?

z. D`. C`. B`. A`. C. O. y. A. B. x. (1) 空间直角坐标系的定义?. z. R. M. Q. y. P. x. (2) 空间直角坐标系上点 M 的坐标?. O. 例题. z. D`. C. y. A. x. 例 1 、如下图,在长方体 OABC-D`A`B`C` 中, |OA|=3 , |OC|=4 , |OD`|=2 ,写出 D` , C , A` , B` 四点的坐标. C`. B`. A`. O. B. 练习. z. D`. C. y. A. x.

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(1) 空间直角坐标系的定义?

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  1. z D` C` B` A` C O y A B x (1) 空间直角坐标系的定义?

  2. z R M Q y P x (2) 空间直角坐标系上点M的坐标? O

  3. 例题 z D` C y A x 例1、如下图,在长方体OABC-D`A`B`C`中,|OA|=3,|OC|=4,|OD`|=2,写出D`,C,A`,B`四点的坐标. C` B` A` O B

  4. 练习 z D` C y A x 1、如下图,在长方体OABC-D`A`B`C`中,|OA|=3,|OC|=4,|OD`|=3,A`C`于B`D`相交于点P.分别写出点C,B`,P的坐标. C` P B` A` P` O B

  5. 练习 z D` C` B` A` C O y A B x 2、如图,棱长为a的正方体OABC-D`A`B`C`中,对角线OB`于BD`相交于点Q.顶点O为坐标原点,OA,OC分别在x轴、y轴的正半轴上.试写出点Q的坐标. Q Q`

  6. 练习 z y x 3、在空间直角坐标系中标出下列各点: A(0,2,4) B(1,0,5) C(0,2,0) D(1,3,4) D 4 3 O 1 D`

  7. (1) 在空间直角坐标系中,任意一点P(x,y,z)到原点的距离: z P(x,y,z) y x O (x,y,0) P`

  8. (1) 在空间直角坐标系中,任意两点P1(x1,y1,z1)和P2(x2,y2,z2)间的距离: z P1(x1,y1,z1) P2(x2,y2,z2) y x H O M N

  9. 练习 • 1、在空间直角坐标系中,求点A、B的中点,并求出它们之间的距离: • A(2,3,5) B(3,1,4) • (2)A(6,0,1) B(3,5,7) 2、在Z轴上求一点M,使点M到点A(1,0,2)与点B(1,-3,1)的距离相等。

  10. 练习 z D` C` B` A` C O y A B x 2、如图,正方体OABC-D`A`B`C`的棱长为a,|AN|=2|CN|,|BM|=2|MC`|,求MN的长. M N

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