4阶行列式求值 搞不懂
问题描述：
4阶行列式求值 搞不懂
4124
1202
10 5 2 0
0117
答
4,1,2,41,2,0,210,5,2,00,1,1,7r2-(1/4)r1:4,1,2,40,7/4,-1/2,110,5,2,00,1,1,7r3-(5/2)r1:4,1,2,40,7/4,-1/2,10,5/2,-3,-100,1,1,7r3-(10/7)r2:4,1,2,40,7/4,-1/2,10,0,-16/7,-80/70,1,1,7r4-(4/7)r2:4,1,2,40,7/4,...