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- What does $QAQ^{-1}$ actually mean? - Mathematics Stack Exchange
I'm self-learning Linear Algebra and have been trying to take a geometric approach to understand what matrices mean visually I've noticed this matrix product pop up repeatedly and can't seem to de
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- Mathematics Stack Exchange
Q A for people studying math at any level and professionals in related fields
- 1 8, 1 4, 1 2, 3 4,7 8英寸分别是多少厘米? - 知乎
把1英寸分成8等分: 1 8 1 4 3 8 1 2 5 8 3 4 7 8 英寸。 This is an arithmetic sequence since there is a common difference between each term In this case, adding 18 to the previous term in the sequence gives the next term In other words, an=a1+d (n−1) Arithmetic Sequence: d=1 8
- 空调一级能效和三级能效开10小时，能差多少电费？ - 知乎
空调制冷+制热全年耗电量相差794-636=158度电 总结 海尔1 5匹空调，一级比三级年省电159度电 格力1 5匹空调，一级比三级年省电158度电 购买建议：空调使用寿命基本在5~10年，如果你在北方，空调使用少，每年只在夏季开2~3个月空调，这期间总耗电量大约相差1000度。
- Taylor series of $\\ln(1+x)$? - Mathematics Stack Exchange
You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
- 2025年 7月 电脑配置推荐（配置单可以直接照抄） - 知乎
2025年七月台式机电脑DIY配置推荐（这篇文章每月都会更新，可以收藏）
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