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A为3X3矩阵,|A|=-2.把A按列分块为A=(A1,A2,A3).其中Aj(j=1,2,3)是A的第j列.求|A1,2A3,A2|
|A3-2A1,3A2,A1|
人气:489 ℃ 时间:2020-01-26 03:04:30
解答
|A1,2A3,A2| = -|A1,A2,2A3| = -2|A1,A2,A3| = -2|A| = 4.
|A3-2A1,3A2,A1|
c1+2c3
= |A3,3A2,A1|
= 3|A3,A2,A1|
= -3|A1,A2,A3|
= 6.
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