若实二次型f(x1,x2,x3)=x21+2x22+3x23+2tx1x2正定,则t的取值蔼围是_____.
若实二次型f(x1,x2,x3)=x21+2x22+3x23+2tx1x2正定,则t的取值蔼围是_____.
【正确答案】:-√2<t<√2
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