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数学
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1+x 1 1 1
1 1-x 1 1
1 1 1+y 1
1 1 1 1-y
用降阶法计算行列式 急
人气:242 ℃ 时间:2020-03-21 13:36:28
解答
1+x 1 1 11 1-x 1 11 1 1+y 11 1 1 1-y第二行减去第一行;第四行减去第三行得1+x 1 1 11-x -x 0 01 1 1+y 10 0 -y -y第一列减去第二列;第三列减去第四列得x 1 0 10 -x 0 00 1 y 10 0 0 -y按照第三行展开得最后结果...
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