线性代数,求高手,需要过程,急,(4)小题和(6)小题,计算行列式
1个回答
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解:
a 1 0 0
-1 b 1 0
0 -1 c 1
0 0 -1 d
=a*[b(cd+1)+d]+(cd+1)
=a(bcd+b+d)+cd+1
=abcd+ab+ad+cd+1
a 1 0 0
-1 b 1 0
0 -1 c 1
0 0 -1 d
=a*[b(cd+1)+d]+(cd+1)
=a(bcd+b+d)+cd+1
=abcd+ab+ad+cd+1
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追答
a,1,0,0
-1,b,1,0
0,-1,c,1
0,0,-1,d
r2+(1/a)r1:
a,1,0,0
0,(ba+1)/a,1,0
0,-1,c,1
0,0,-1,d
r3+[a/(ab+1)]r2:
a,1,0,0
0,(ba+1)/a,1,0
0,0,(cba+c+a)/(ba+1),1
0,0,-1,d
r4+[(ba+1)/(cba+c+a)]r3:
a,1,0,0
0,(ba+1)/a,1,0
0,0,(cba+c+a)/(ba+1),1
0,0,0,(dcba+dc+da+ba+1)/(cba+c+a)
=a*[(ba+1)/a]*[(cba+c+a)/(ba+1)]*[(dcba+dc+da+ba+1)/(cba+c+a)]
=ab+ad+cd+abcd+1
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