• 2022-05-28
    设A,B都是n阶方阵,则下列结论正确的是( )
    A: 若AB是奇异矩阵,则A和B都是奇异矩阵
    B: 若AB是可逆矩阵,则A和B都是可逆矩阵
    C: 若 ,则
    D: 若A和B都是对称矩阵,则AB也是对称矩阵
  • B

    举一反三

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    • 0

      在下列的HTML中,哪个可以产生超链接? A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a9bcf63958144ed794c2429877db052a.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/5f5d626c8bba4c9486c2455dc0f20be5.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/3a165307757a4da5b4e34381b1fe8cf5.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/334e855f187b4c2684d73890e18d5988.png" />

    • 1

      中性水溶液是指( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/9bef71113e73499f9f3d9f877a0d07f3.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/315534da2fa24656b8ac34316eb43211.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/0f25c8c53d964d3290ee60bab0aa7fe7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/0e9eca0e483743c787605572ed065b97.png" />

    • 2

      下列运算正确的是(). A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/b365f98671664fe28462e7f104a04561.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/4b0c61e395884131b3bd01a42cf554f2.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/40f0e907cde84b76bb93fce803d3960c.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/ce3ec94698c242069f90ba8debd032db.png" >

    • 3

      和逻辑式<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/6e44002682ae467796cf764f95bddba9.png" >表示不同逻辑关系的逻辑式是()。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/2ed596686e0b4888be3e30cf991d4790.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/106e515ddf2e4efaaadb70de431d11ca.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/61241e1bfc1a46c6bf504129ed8c500d.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/b6133dc7cf894cc586f45f7a945b8325.png" >

    • 4

      下列式子中,正确的是()。 A: A+A=A B: A<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/f3126967d9ec4564a40eb6115699ae51.png" >1=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/0faff7be16814509823804103e6ad7d5.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/5cc39d909e9841baa3de9661f7c75548.png" > D: A<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/f3126967d9ec4564a40eb6115699ae51.png" >0=A