2．已知ef分别是正方体abcd A1b1c1d1的棱bc和cd的中点求 1a1d与ef所成角的大小 2a1f与平面b1eb所 Sketch Coloring Page

2．已知ef分别是正方体abcd A1b1c1d1的棱bc和cd的中点求 1a1d与ef所成角的大小 2a1f与平面b1eb所 Template

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tomski2．已知ef分别是正方体abcd a1b1c1d1的棱bc和cd的中点求 1a1d与ef所成角的大小 coloring

如图，正方体ABCD A1B1C1D1中，E，F分别是AB，AA1的中点．求证：（1）E，C，D1，F四点共面；（2）CE，D1F，DA三线共 sketch template

2．已知EF分别是正方体ABCD A1B1C1D1的棱BC和CD的中点求 1A1D与EF所成角的大小 2A1F与平面B1EB所 sketch template

PPT 空间几何体的体积 PowerPoint Presentation Free Download ID6407495 sketch template

如图，在棱长为a的正方体ABCD A1B1C1D1中，P、Q分别是AD1、BD的中点．（1）求证：PQ∥平面DCC1D1．（2）求证：平面 sketch template

如图所示正方体ABCD A1B1C1D1中E是C1C的中点则BE与平面B1BD所成角的余弦值为题目和参考答案——青夏教育精英家教�—— sketch template

如图所示在正方体ABCD A1B1C1D1中棱长为aMN分别为A1B和AC上的点A1M=AN=则MN与平面BB1C1C的位置关系是 sketch template

如图正方体ABCD A1B1C1D1的棱长为1P为BC的中点Q为线段CC1上的动点过点APQ的平面截该正方体所得的截面记为S则 sketch template

如图已知长方体ABCD A1B1C1D1中AB=BC=2AA1=1点EF分别是A1B1B1C1的中点点O是AB与BD的交点．1 sketch template

如图所示正方体ABCD A1B1C1D1中E是C1C的中点则BE与平面B1BD所成角的余弦值为题目和参考答案——青夏教育精英家教�—— sketch template

如图1正方体ABCD A1B1C1D1的棱长为aE是AD的中点．现截去部分几何体后得到如图2所示的四棱锥A A1B1CD．Ⅰ求四棱锥A sketch template

已知正方体ABCD A1B1C1D1的棱长为a．1求点C1到平面AB1D1的距离2求平面CDD1C1与平面AB1D1所成的二面角 sketch template

如图在正方体ABCD A1B1C1中MN分别是BBBC的中点则图中阴影部分在平面ADD1A1上的投影为图中的 ——青夏教育 sketch template

如图所示在正方体ABCD A1B1C1D1中E是棱DD1的中点．Ⅰ求直线BE与平面ABB1A1所成的角的正弦值Ⅱ在棱C1D1上 sketch template

PPT 空间�量之应用 3 PowerPoint Presentation Free Download ID3685573 sketch template

6．正方体ABCD A1B1C1D1的侧面ABB1A1内有一动点P到直线AA1和BC的距离相等则动点P的轨迹是 A．线段——青夏 sketch template

Z Math【高中数学�8——正方体的截面形状探究知乎 sketch template

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一个正方体的六个面上分别标有字母ABCDEF下图是此正方体的两种不同放置则与D面相对的面上的字母是 ．题目和参考答案——青夏 sketch template

18．已知棱长为1的正方体AC1EF分别是B1C1C1D的中点． 1求证EFDB共面 2求点A1到平面的BDEF的距离 sketch template

如图在棱长为3的正方体ABCD A1B1C1D1中点P是平面A1BC1内一动点且满足PD PB1=2 $sqrt{13}$则 sketch template

8．图1是正方体各个面展开后如右图2所示对应的六个面分别用字母ABCDEF表示则正方体前后两个面分别是展开后图中的 sketch template

在正方体的六个表面中与异面组成角的对角线共有条——青夏教育精英家教�—— sketch template

一个正方体的六个面上分别标有字母ABCDEF下图是此正方体的两种不同放置则与D面相对的面上的字母是 ．题目和参考答案——青夏 sketch template

正方体ABCD A1B1C1D1的棱长为1E是CD中点F是BB1中点则四面体AD1EF的体积是 ．——青夏教育精英家教�—— sketch template

棱长为a的正方体ABCD A1B1C1D1中AB的中点为MDD1的中点为N则异面直线A1M与C1N所成角的大小为 A30° B45 sketch template

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在棱长为的正方体中，为棱的中点，点在正方体的表面上高途 sketch template

在正方体ABCD A1B1C1D1G为CC1的中点O为底面ABCD的中心求证A1O⊥平面GBD ——青夏教育精英家教�—— sketch template

如图已知正方体棱长为2点是正方形的中心点分别是棱的中点．设点分别是点在平面内的正投影． Ⅰ求以为顶点以四边形在平面内的正投影为 sketch template

一个正方体的每个面分别标有数字123456根据图中该正方体的三种状态所显示的数字可推出“ 处的数字是 ——青夏教育精英家教�—— sketch template

如图在长方体ABCD A1B1C1D1中EH分别是棱A1B1C1D1上的点点E 与B1不重合且EH∥A1D1过EH的平面与棱 sketch template

根据正方体和正方体的特征判断 是长方体 是正方体都不是的有．题目和参考答案——青夏教育精英家教�—— sketch template

用3个同样大小的正方体分别按照要求搭一搭 1从上面看到的是 2从上面看到的是 3从正面看到的是 分别有几种不同的搭法 sketch template

在棱长为a的正方体ABCD A1B1C1D1中 O1O2分别为正方形AB B1A1 BCC1B1的中心则四棱锥B1 A1O1O2C1的 sketch template

已知正四面体ABCD的棱长为1求1该四面体的内切球的表面积2与该四面体各条棱均相切的球的体积3该四面体的外接球上AB两点间 sketch template

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