后面行列式第二个元素应该是 4/3
|(2x,4/3,1)(2y,0,1)(2z,1,1)|=2|(x,4/3,1)(y,0,1)(z,1,1)| 【 c1提出2】
=2*(1/3)|(x,4,1)(y,0,1)(z,3,1)| 【c2提出 1/3 】
=2*(1/3)*1
=2/3
后面行列式第二个元素应该是 4/3
|(2x,4/3,1)(2y,0,1)(2z,1,1)|=2|(x,4/3,1)(y,0,1)(z,1,1)| 【 c1提出2】
=2*(1/3)|(x,4,1)(y,0,1)(z,3,1)| 【c2提出 1/3 】
=2*(1/3)*1
=2/3