设随机变量，则=。(注： )http://p.ananas.chaoxing.com/star3/origin/39a36111a374e238aff071bcbee7ad00.gifhttp://p.ananas.chaoxing.com/star3/origin/55967500e4b0ec35e2d51bb3.gifhttp://p.ananas.chaoxing.com/star3/origin/17322168bc793ffb671aa05ad0e2835c.gif
举一反三
- 设是圆,则https://p.ananas.chaoxing.com/star3/origin/d8b5edc9a2457c461a3685877f8606ab.pnghttps://p.ananas.chaoxing.com/star3/origin/5f3c1256fa1597901980dc868dfb57f7.pnghttps://p.ananas.chaoxing.com/star3/origin/1932e2a8e9452d4d6f94177a0ca40384.pnghttps://p.ananas.chaoxing.com/star3/origin/5785decddcc5b175015fc7c46d4d8405.png
- 设,,矩阵,则秩 ____。https://p.ananas.chaoxing.com/star3/origin/37ef575fe498777db654afddca62fe2c.pnghttps://p.ananas.chaoxing.com/star3/origin/a615458f7dcae581d0fff21cde15a403.pnghttps://p.ananas.chaoxing.com/star3/origin/290ba9cd94f47cfdfb6c2f491dc6ba09.pnghttps://p.ananas.chaoxing.com/star3/origin/4552fd27a3592e03f9b28737ec534441.png
- <img src="http://p.ananas.chaoxing.com/star3/origin/560b9590e4b040cfea1a582d.png"/> <img src="http://p.ananas.chaoxing.com/star3/origin/560b9591e4b040cfea1a582e.png"/> <img src="http://p.ananas.chaoxing.com/star3/origin/560b9593498ed981287fd9e9.png"/>()， <img src="http://p.ananas.chaoxing.com/star3/origin/560b9593498ed981287fd9ea.png"/>()； <img src="http://p.ananas.chaoxing.com/star3/origin/560b9593498ed981287fd9ec.png"/> <img src="http://p.ananas.chaoxing.com/star3/origin/560b9593e4b040cfea1a5830.png"/>()， <img src="http://p.ananas.chaoxing.com/star3/origin/560b9593498ed981287fd9ea.png"/>()
- 设是闭区域:,,则https://p.ananas.chaoxing.com/star3/origin/67f3b9ce1bda9b4c999134a2f3035a9c.pnghttps://p.ananas.chaoxing.com/star3/origin/3dbbc854a126017299127fa64bccd615.pnghttps://p.ananas.chaoxing.com/star3/origin/bc5ca4972bce897f0cca16630df18fda.pnghttps://p.ananas.chaoxing.com/star3/origin/80014c2d2a19dc5bb425db83989526d0.png
- 设方阵满足,则或。https://p.ananas.chaoxing.com/star3/origin/30cf26f3ed91b1f13b2d9ca4c0df7b0c.pnghttps://p.ananas.chaoxing.com/star3/origin/023cd430fe912df53922e1e5ec2b2bad.pnghttps://p.ananas.chaoxing.com/star3/origin/89f41b9fbae5688e4f7df68c8f97a907.pnghttps://p.ananas.chaoxing.com/star3/origin/02c3eb4968eb753b7c847c9a09b4ba63.png