求出矩阵得
1 t 1
t 4 0
1 0 2
正定的话就是任意代数余子式为0
4-t^2=0 所以T=2 T=-2
f（x,y,z)=x^2+4y^2+2Z^2+2txy+2xz为正定二次型,求t
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