这个是那个就是计算矩阵行列式的mathisfun这个网站

https://www.mathsisfun.com/algebra/matrix-determinant.html#:~:text=To%20work%20out%20the%20determinant%20of%20a%203%C3%973,remember%20the%20minus%20in%20front%20of%20the%20b


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