举个3x3矩阵的例子
A = rand(3);
A(9) = (1+A(3)*A(5)*A(7)-A(2)*A(6)*A(7)+A(1)*A(6)*A(8)-A(3)*A(4)*A(8))/(A(1)*A(5)-A(2)*A(4));
disp(det(A));
A(9) = (-1+A(3)*A(5)*A(7)-A(2)*A(6)*A(7)+A(1)*A(6)*A(8)-A(3)*A(4)*A(8))/(A(1)*A(5)-A(2)*A(4));
disp(det(A));
原理就是随机出N个数，第N+1个数算出来
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