n+1阶行列式
x a1 a2 a3 … an
a1 x a2 a3 … an
a1 a2 x a3 … an
a1 a2 a3 x … an
a1 a2 a3 a4 … x
人气：465 ℃ 时间：2020-06-17 21:36:35
解答
先把所有列加到最后一列,得到最后一列是(x+a1+a2+...+an),提取最后一列的因式(x+a1+a2+...+an),此时最后一列全为1,然后分别用最后一列的1乘(-ai)(1
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