解下列线性方程,要有计算过程
2个回答
展开全部
用《初等变换》做还是《克莱姆》做?
先用克莱姆吧
D=|(2,-1,-1,1)(1,1,-2,1)(4,-6,2,-2)(0,6,6,5)|=96
D1=|(2,-1,-1,1)(4,1,-2,1)(4,-6,2,-2)(3,6,6,5)|=384
D2=|(2,2,-1,1)(1,4,-2,1)(4,4,2,-2)(0,3,6,5)|=288
D3=|(2,-1,2,1)(1,1,4,1)(4,-6,4,-2)(0,6,3,5)|=0
D4=|(2,-1,-1,2)(1,1,-2,4)(4,-6,2,4)(0,6,6,3)|=-288
∴x1=D1/D=384/96=4
x2=D2/D=288/96=3
x3=D3/D=0/96=0
x4=D4/D=-288/96=-3
即 x1=4、x2=3、x3=0、x4=-3
先用克莱姆吧
D=|(2,-1,-1,1)(1,1,-2,1)(4,-6,2,-2)(0,6,6,5)|=96
D1=|(2,-1,-1,1)(4,1,-2,1)(4,-6,2,-2)(3,6,6,5)|=384
D2=|(2,2,-1,1)(1,4,-2,1)(4,4,2,-2)(0,3,6,5)|=288
D3=|(2,-1,2,1)(1,1,4,1)(4,-6,4,-2)(0,6,3,5)|=0
D4=|(2,-1,-1,2)(1,1,-2,4)(4,-6,2,4)(0,6,6,3)|=-288
∴x1=D1/D=384/96=4
x2=D2/D=288/96=3
x3=D3/D=0/96=0
x4=D4/D=-288/96=-3
即 x1=4、x2=3、x3=0、x4=-3
追问
那如果用初等行变换做呢?
追答
你不能先采纳一下吗?采纳了,你也有经验值的增加。
你放心,因为你是登录提问,无论你采纳后追问不追问,我都能私信你。给出初等变换的结果。当然《私信》中格式不容易对整齐,最好还是再追问一次。
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展开全部
用《初等变换》做还是《克莱姆》做?
先用克莱姆吧
D=|(2,-1,-1,1)(1,1,-2,1)(4,-6,2,-2)(0,6,6,5)|=96
D1=|(2,-1,-1,1)(4,1,-2,1)(4,-6,2,-2)(3,6,6,5)|=384
D2=|(2,2,-1,1)(1,4,-2,1)(4,4,2,-2)(0,3,6,5)|=288
D3=|(2,-1,2,1)(1,1,4,1)(4,-6,4,-2)(0,6,3,5)|=0
D4=|(2,-1,-1,2)(1,1,-2,4)(4,-6,2,4)(0,6,6,3)|=-288
∴x1=D1/D=384/96=4
x2=D2/D=288/96=3
x3=D3/D=0/96=0
x4=D4/D=-288/96=-3
即 x1=4、x2=3、x3=0、x4=-3
先用克莱姆吧
D=|(2,-1,-1,1)(1,1,-2,1)(4,-6,2,-2)(0,6,6,5)|=96
D1=|(2,-1,-1,1)(4,1,-2,1)(4,-6,2,-2)(3,6,6,5)|=384
D2=|(2,2,-1,1)(1,4,-2,1)(4,4,2,-2)(0,3,6,5)|=288
D3=|(2,-1,2,1)(1,1,4,1)(4,-6,4,-2)(0,6,3,5)|=0
D4=|(2,-1,-1,2)(1,1,-2,4)(4,-6,2,4)(0,6,6,3)|=-288
∴x1=D1/D=384/96=4
x2=D2/D=288/96=3
x3=D3/D=0/96=0
x4=D4/D=-288/96=-3
即 x1=4、x2=3、x3=0、x4=-3
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