2014李永乐数学二复习全书例6.7疑问二次型x1^2+x2^2+x3^2-4x1x2-4x1x3+2ax2x3经正交变换为3y1^2+3y2^2-by3^2求a和b求出b=-3 求a时 我用的是A的行列式的值等于-27 求出答案为a=10或a=-2 答案直接用|3E-A|得出a等
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![2014李永乐数学二复习全书例6.7疑问二次型x1^2+x2^2+x3^2-4x1x2-4x1x3+2ax2x3经正交变换为3y1^2+3y2^2-by3^2求a和b求出b=-3 求a时 我用的是A的行列式的值等于-27 求出答案为a=10或a=-2 答案直接用|3E-A|得出a等](/uploads/image/z/10397598-6-8.jpg?t=2014%E6%9D%8E%E6%B0%B8%E4%B9%90%E6%95%B0%E5%AD%A6%E4%BA%8C%E5%A4%8D%E4%B9%A0%E5%85%A8%E4%B9%A6%E4%BE%8B6.7%E7%96%91%E9%97%AE%E4%BA%8C%E6%AC%A1%E5%9E%8Bx1%5E2%2Bx2%5E2%2Bx3%5E2-4x1x2-4x1x3%2B2ax2x3%E7%BB%8F%E6%AD%A3%E4%BA%A4%E5%8F%98%E6%8D%A2%E4%B8%BA3y1%5E2%2B3y2%5E2-by3%5E2%E6%B1%82a%E5%92%8Cb%E6%B1%82%E5%87%BAb%3D-3+%E6%B1%82a%E6%97%B6+%E6%88%91%E7%94%A8%E7%9A%84%E6%98%AFA%E7%9A%84%E8%A1%8C%E5%88%97%E5%BC%8F%E7%9A%84%E5%80%BC%E7%AD%89%E4%BA%8E-27+%E6%B1%82%E5%87%BA%E7%AD%94%E6%A1%88%E4%B8%BAa%3D10%E6%88%96a%3D-2+%E7%AD%94%E6%A1%88%E7%9B%B4%E6%8E%A5%E7%94%A8%7C3E-A%7C%E5%BE%97%E5%87%BAa%E7%AD%89)
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