来自关键的问题
设a1,a2,a3为3维列向量,行列式|a1a2a3|=d,则|3a1+a22a2a3|=
设a1,a2,a3为3维列向量,行列式|a1a2a3|=d,则|3a1+a22a2a3|=
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2020-11-1602:24
设a1,a2,a3为3维列向量,行列式|a1a2a3|=d,则|3a1+a22a2a3|=
设a1,a2,a3为3维列向量,行列式|a1a2a3|=d,则|3a1+a22a2a3|=
|3a1+a22a2a3|
=|3a12a2a3|+|a22a2a3|
=|3a12a2a3|+0
=3^3*2^3|a1a2a3|
=216|a1a2a3|
=216d