a b b bb a b bb b a bb b b ar1+r2+r3+r4:a+3b a+3b a+3b a+3bb a b bb b a bb b b a第一列提取a+3b得1 1 1 1b a b bb b a bb b b ar2-br1,r3-br1,r4-br1:1 1 1 10 a-b 0 00 0 a-b 00 0 0 a-b这是一个上三角行列...
计算4阶行列式x y y yD=丨y x y yy y x yy y y x
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