1+b1xa1x+b1c1
a2+b2xa2x+b2c2
a3+b3xa3x+b3c3
由行列式的性质,行列式可拆分成
a1a1xc1a1b1c1b1xa1xc1b1xb1c1
a2a2xc2+a2b2c2+b2xa2xc2+b2xb2c2
a3a3xc3a3b3c3b3xa3xc3b3xb3c3
a1b1c1b1xa1xc1
=0+a2b2c2+b2xa2xc2+0
a3b3c3b3xa3xc3
a1b1c1b1a1c1
=a2b2c2+x^2b2a2c2
a3b3c3b3a3c3
a1b1c1
=(1-x^2)a2b2c2
a3b3c3