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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
  • 知乎 - 知乎
    知乎是一个可信赖的问答社区,汇集了各行各业的亲历者、内行人和领域专家,为用户提供高质量的内容和交流机会。
  • 知乎 - 有问题,就会有答案
    知乎,中文互联网高质量的问答社区和创作者聚集的原创内容平台,于 2011 年 1 月正式上线,以「让人们更好的分享知识、经验和见解,找到自己的解答」为品牌使命。
  • 卡路里、千焦、大卡傻傻分不清楚?关于热量看这一篇就够了
    千焦和千卡的换算关系是:1000千焦=238 9大卡,1 大卡(千卡)=4 18千焦(KJ),一般千焦换算成大卡可以直接除以4 18来计算如果要粗略计算热量,直接除以4即可。
  • what is 1 - 1 2 + 1 3 - 1 4 + 1 5 - 1 6 + 1 7 - 1 8 +1 9
    Please provide additional context, which ideally explains why the question is relevant to you and our community Some forms of context include: background and motivation, relevant definitions, source, possible strategies, your current progress, why the question is interesting or important, etc
  • 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
  • Mathematics Stack Exchange
    Let x1,x2,x3,x4 x 1, x 2, x 3, x 4 denote the four roots of the equation x4 + kx2 + 90x − 2009 = 0 x 4 + k x 2 + 90 x 2009 = 0 If x1x2 = 49 x 1 x 2 = 49, then find the value of k k
  • 1加十三手机(一加13)怎么样?体验3天优缺点测评
    二:一加13(1加十三手机)优点 强大的性能配置:搭载了骁龙8至尊版移动平台,这是高通最新一代的旗舰级处理器,采用台积电第二代3nm工艺制程,CPU则采用了高通自研Oryon架构,拥有2个超大核和6个大核,双超大核频率高达4 32GHz,性能表现卓越。
















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