计算行列式|a-b-c 2a 2a| |2b b-a-c 2b| |2c.2c.C-a-b|

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计算行列式|a-b-c2a2a||2bb-a-c2b||2c.2c.C-a-b|计算行列式|a-b-c2a2a||2bb-a-c2b||2c.2c.C-a-b|计算行列式|a-b-c2a2a||2bb

计算行列式|a-b-c 2a 2a| |2b b-a-c 2b| |2c.2c.C-a-b|
计算行列式|a-b-c 2a 2a| |2b b-a-c 2b| |2c.2c.C-a-b|

计算行列式|a-b-c 2a 2a| |2b b-a-c 2b| |2c.2c.C-a-b|
|a-b-c 2a 2a| |2b b-a-c 2b| |2c.2c.C-a-b|
=|a+b+c a+b+c a+b+c| |2b b-a-c 2b| |2c.2c.C-a-b|
=(a+b+c)|1 1 1| |0 -b-a-c 0| |0.0.-C-a-b|
=(a+b+c)^3

| | c(c+b)+ac d(d+b)+da | = (b-a)(c-a)(d-a)(c-b)(d-b)[d(d+b)+da-ac-c(c+b)] =(b-a)(c-a)(d-a)(c-b)(d-b