设a1,a2,a3,a4是4维向量,且a1可由,a2,a3,a4线性表示,则|a1,a2,a3,a4|=

问题描述:

设a1,a2,a3,a4是4维向量,且a1可由,a2,a3,a4线性表示,则|a1,a2,a3,a4|=

a1可由,a2,a3,a4线性表示,
∴a1,a2,a3,a4线性相关,
∴行列式|a1,a2,a3,a4|=0.若a1,a2,a3,a4线性无关,
则行列式|a1,a2,a3,a4|≠0.