计算下列乘积:

admin2020-11-12  18

问题 计算下列乘积:

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答案[*] =a11x12+a12x1x2+a13x1x3+a12x2x1+a22x22+a23x2x3+a13x3x1+a23x3x2+a33x32 =a11x12+a22x22+a33x32+2a12x1x2+2a13x1x3+2a23x2x3.

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