求[tex=1.714x1.214]iQ/iEbsDm/5Je+BSznZxUQ==[/tex], 设[tex=10.857x2.786]QN0fTQbn6M33pU3gx/S2sss4e9wDjNaCZaoovSbPeDsKBXJe5EVYOnRmvAwZ1bn9KdAikskiB55ETxxZu+U+omzell5JFBu8ktM0xnhDMhE=[/tex]
举一反三
- 设A为m阶实对称阵,求证:(1) 若[tex=1.714x1.214]iQ/iEbsDm/5Je+BSznZxUQ==[/tex]存在,则[tex=1.714x1.214]iQ/iEbsDm/5Je+BSznZxUQ==[/tex]也是对称阵;(2) 若M为m阶方阵,则[tex=3.286x1.214]Wqw4ddZ65nvvta6JGh3EpQ==[/tex]为对称阵.
- 设[tex=6.786x2.786]3BT1BgBZQ5uJXxD5dg+w29hP8bh7zob8OMKjCfTXxsgtcNV4bbSe1iMacarr9C03oac+Rn4rr06QHA2bDuuftw==[/tex], 其中[tex=2.0x1.214]2UoWlZMHs+82muLB9sdIZw==[/tex]为方阵。当[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]可逆时,求[tex=1.714x1.214]iQ/iEbsDm/5Je+BSznZxUQ==[/tex]。
- 设 [tex=1.714x1.214]iQ/iEbsDm/5Je+BSznZxUQ==[/tex] 存在,且 [tex=4.0x1.5]xIOgjjqRxMw/hqzLeAemXA==[/tex], 则 [tex=3.929x1.571]deak5d3KtYXQ8JGw+HvMYr/YmplS0KrS/6TDEIrHFPE=[/tex][input=type:blank,size:6][/input]
- 设[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]为正定矩阵, 证明:[tex=1.714x1.214]iQ/iEbsDm/5Je+BSznZxUQ==[/tex]与[tex=1.143x1.071]DFelGZAPNOqMgdbfKVoEHA==[/tex]都是正定矩阵.
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']