[Bug] 行列式初等变换时不能乘以 1/x
>> transform(A,r2*(-1))
1 x 2 4
0 2x^2-1x^1 4x^1-2 8x^1-3
0 -3x^1+2 3x^1-6 -13
0 -2x^1+5 -1 x^1-8
>> transform(A,c2*(1/x))
0
0 2x^2-1x^1 4x^1-2 8x^1-3
0 -3x^1+2 3x^1-6 -13
0 -2x^1+5 -1 x^1-8
>> transform(A,c2*(-1))
1 -2 -1x^1 4
0 4x^1-2 2x^2-1x^1 -8x^1+3
0 -3x^1+6 3x^1-2 -13
0 1 2x^1-5 x^1-8
>> transform(A,r2-r4*(4x-2))
-2 -1x^1 4
4x^1-2 2x^2-1x^1 -8x^1+3
-3x^1+6 3x^1-2 -13
1 2x^1-5 x^1-8
>> transform(A,r2<-->r3)
1 -2 -1x^1 4
0 1 2x^1-5 x^1-8
0 0 -6x^2+23x^1-10 -4x^2+26x^1-13
0 0 6x^2-24x^1+28 3x^2-30x^1+35
>> transform(A,r4+r3)
1 -2 -1x^1 4
0 1 2x^1-5 x^1-8
0 0 -6x^2+23x^1-10 -4x^2+26x^1-13
0 0 (6*x^2-24*x^1+28-6*x^2+23*x^1-10) (3*x^2-30*x^1+35-4*x^2+26*x^1-13)