问题描述: 四阶行列式计算4 1 2 4 1 2 0 2 10 5 2 0 0 1 1 7 1个回答 分类:数学 2014-10-18 问题解答: 我来补答 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,-1/2,10,0,-16/7,-80/70,0,9/7,45/7r4-(9/16)r3:4,1,2,40,7/4,-1/2,10,0,-16/7,-80/70,0,0,0=4*(7/4)*(-16/7)*0=0 展开全文阅读