如图所行列式求解详细过程
教材答案为a1a2a3a4(1/a1+1/a2+1/a3+1/a4)但是我换了好多算法答案为:a1a2a3a4(1/a1+1/a2+1/a3+1/a4+1)...
教材答案为a1a2a3a4(1/a1+1/a2+1/a3+1/a4) 但是我换了好多算法答案为:a1a2a3a4(1/a1+1/a2+1/a3+1/a4+1)
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各行一最后一行:
a1,0,0,-a4
0,a2,0,-a4
0,0,a3,-a4
1,1,1,1+a4
各列分别提取a1,a2,a3,a4
=a1a2a3a4×
1,0,0,-1
0,1,0,-1
0,0,1,-1
1/a1,1/a2,1/a3,1/a4+1
各列加到最后一列:
=a1a2a3a4×
1,0,0,0
0,1,0,0
0,0,1,0
1/a1,1/a2,1/a3,1/a1+1/a2+1/a3+1/a4+1
按最后一列展开:
=a1a2a3a4×(1/a1+1/a2+1/a3+1/a4+1)x
1,0,0
0,1,0
0,0,1
=a1a2a3a4×(1/a1+1/a2+1/a3+1/a4+1)
你是正确的。
a1,0,0,-a4
0,a2,0,-a4
0,0,a3,-a4
1,1,1,1+a4
各列分别提取a1,a2,a3,a4
=a1a2a3a4×
1,0,0,-1
0,1,0,-1
0,0,1,-1
1/a1,1/a2,1/a3,1/a4+1
各列加到最后一列:
=a1a2a3a4×
1,0,0,0
0,1,0,0
0,0,1,0
1/a1,1/a2,1/a3,1/a1+1/a2+1/a3+1/a4+1
按最后一列展开:
=a1a2a3a4×(1/a1+1/a2+1/a3+1/a4+1)x
1,0,0
0,1,0
0,0,1
=a1a2a3a4×(1/a1+1/a2+1/a3+1/a4+1)
你是正确的。
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