(x1,x2,x3)=(k-1)x1+(k+2)x2+(k+1)x3,若为正定,k的范围?x1 x2 x3都是平方项
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![(x1,x2,x3)=(k-1)x1+(k+2)x2+(k+1)x3,若为正定,k的范围?x1 x2 x3都是平方项](/uploads/image/z/7151906-2-6.jpg?t=%28x1%2Cx2%2Cx3%29%3D%28k-1%29x1%2B%28k%2B2%29x2%2B%28k%2B1%29x3%2C%E8%8B%A5%E4%B8%BA%E6%AD%A3%E5%AE%9A%2Ck%E7%9A%84%E8%8C%83%E5%9B%B4%3Fx1+x2+x3%E9%83%BD%E6%98%AF%E5%B9%B3%E6%96%B9%E9%A1%B9)
(x1,x2,x3)=(k-1)x1+(k+2)x2+(k+1)x3,若为正定,k的范围?x1 x2 x3都是平方项
(x1,x2,x3)=(k-1)x1+(k+2)x2+(k+1)x3,若为正定,k的范围?
x1 x2 x3都是平方项
(x1,x2,x3)=(k-1)x1+(k+2)x2+(k+1)x3,若为正定,k的范围?x1 x2 x3都是平方项
即要求每一项的系数大于零,所以k〉1