• 2022-06-03
    设[tex=0.786x1.286]TKU5UzNEMzEJwORo6mbEYA==[/tex]是[tex=0.643x0.786]FU7w6l1IEII0B13k5eE1RA==[/tex]阶可逆矩阵,[tex=1.0x1.0]1FxgYWJ8+K7k+WveMA+HgE0t3in4r5SVXKzEh99S2mk=[/tex]是[tex=2.286x1.286]I06yRpy8ahH/21Lu+I9pOg==[/tex]矩阵,且[tex=10.786x3.5]1FxgYWJ8+K7k+WveMA+HgMuwybondqV5sCRcDKdvNGd4tzO40WnQ86qvzRRIgKmwBsGp4TjN+5on06AxlPlmlwyGo+hhA6UMO89pNpku8hOWBlf5AvSKx2y6QyNKjCOm7KDS3d0OrFQV83syEQKRJb5dmURShTOQ8UqPf7olHHI=[/tex],试用分块矩阵的乘法,求一个[tex=4.786x1.286]9GGFGpGcUFxzBsQ2lmZR+73/PcMmakj821OLQd42yb4=[/tex]矩阵[tex=0.929x1.0]r5Haq7W1lVGBc4dFEM2Zk1042rAqwO2NsSIOA9UOXzQ=[/tex],使得[tex=7.071x2.786]r5Haq7W1lVGBc4dFEM2Zk88512tcDydigD0n9GG/Ty5rukg19ulyW+5+4RYsQ1zw3tmgGIx/Y4JzCB7vgKNPAggHO6sQhtSgoej7t+XnzTP7exhoHd/78sEX2t8P3GZ+oiUczkOkj2x9kJDkYYOnRA==[/tex]。
  • 解:设[tex=5.929x1.357]r5Haq7W1lVGBc4dFEM2ZkzKRYb1zfLpp1yNC4HzB0ntVJiFCoGm/AKQOyVy+havvIrCFeG1npOIgf/aYJIkwOmnPVYOu1/xPyOyvIE3s2xc=[/tex],其中[tex=1.286x1.214]r5Haq7W1lVGBc4dFEM2Zk05egS/anV+hsIWrsE2i0yg=[/tex]为[tex=2.357x1.286]ipxJJPrLnQ3B4VR0IxR3/g==[/tex]矩阵,[tex=1.286x1.214]r5Haq7W1lVGBc4dFEM2Zk5GpJQaepJIingnFTyOE3Po=[/tex]为[tex=2.286x1.286]ugpooQUP6U466kcn2eESAg==[/tex]矩阵,[tex=14.143x2.786]r5Haq7W1lVGBc4dFEM2Zk88512tcDydigD0n9GG/Ty5rukg19ulyW+5+4RYsQ1zw3tmgGIx/Y4JzCB7vgKNPAggHO6sQhtSgoej7t+XnzTO8fvkYf4ulhFj6oalWPAs6zLNT/Wrjie9twhHcjJnPAd3O1rovQ7EYjXaqINcI0oXxQF93paJS/bOETgVBfFAXMTG8BiZWuQXauDzaR3wq3NFSJgndyQyp1GprJ+E6GFB0Al8dn3NyRm6VuEGxgS1V3igaFOxp3EuAfBTAsi5aBHeaS/PzdeKJrTEhkVDXoKI=[/tex][tex=5.429x1.214]r5Haq7W1lVGBc4dFEM2ZkxNMups+POB1btW5QPt8x88+h/nz9qZl9c7J+fFGC576xfqO4PSgTgfpX0OQjGTdOaMQQ8RAkPlC26sfptRBEO8=[/tex],只要取[tex=4.643x1.214]r5Haq7W1lVGBc4dFEM2ZkxNMups+POB1btW5QPt8x89DsAKr/bqP12i8np9mVZchcsF5xbUB8+t1xAnrFcagNA==[/tex],[tex=4.0x1.214]r5Haq7W1lVGBc4dFEM2Zk+qBFDbRlIZBWpKeB8mpO74CeM0duEIx1e4m1zHGEPGC[/tex],即有[tex=7.071x2.786]ZeXmt4Og2leBNgS2vOaZDZQB0nbvJlMfG2deoKsgvS23zjdRYZyclL4ts/U8jI1dLVn0JFy2WPYnP75spVXgzIEr4ipByBPg6ffPpk3LDZYkqndfpRktHq6YQLn5n5xY+Xb2Vpe4zpM0h2kjha7cjw==[/tex],因此取[tex=6.571x1.571]r5Haq7W1lVGBc4dFEM2ZkzKRYb1zfLpp1yNC4HzB0nsyQG5/hiRPZCK0naEelJGwLeH3wOmkPrTVom0SEQA7MnfZhBJ72HaPPS7M+ihMKeY=[/tex],其中[tex=1.143x1.286]AcFumj5DdQWZJdWAfuXvZg==[/tex]第一列全为零即可。

    举一反三

    内容

    • 0

      A=[1 2 3 4 5 6 7 8 9]A(5)=[]A=1 4 7 5 8 3 6 9

    • 1

      已知a=[1 2 3; 4 5 6; 7 8 9],执行命令:a([3,1],:)=a([1,3],:),a将变为( )。 A: [4 5 6;4 5 6;4 5 6] B: [7 8 9;4 5 6;1 2 3] C: [2 2 2;5 5 5;8 8 8] D: [3 2 1;6 5 4;9 8 7]

    • 2

      将矩阵a=[1 2 3;4 5 6;7 8 9]改变成 b=[3 6 9;2 5 8;1 4 7]的命令是( )。

    • 3

      【阅读理解(选择)/完型填空】基于以下描述回答 1-2 题: 下表是 9 名评委对 10 名学生的毕业设计进行等级评定结果: 评委 A B C D E F G H I J 1 1 2 4 3 9 6 5 8 7 10 2 1 4 2 5 6 7 3 10 8 9 3 1 3 4 5 2 8 9 6 10 7 4 1 3 4 5 2 6 10 8 7 9 5 1 9 2 5 6 3 4 8 10 7 6 1 4 9 2 5 6 7 3 10 8 7 1 3 5 10 2 6 9 7 8 4 8 1 3 5 7 6 4 8 10 2 9 9 1 2 8 4 9 6 3 7 5 10

    • 4

      设DES加密算法中的一个S盒为: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 14 4 13 1 2 15 11 8 3 10 6 12 5 9 0 7 0 15 7 4 14 2 13 1 10 6 12 11 9 5 3 8 4 1 14 8 13 6 2 11 15 12 9 7 3 10 5 0 15 12 8 2 4 9 1 7 5 11 A: 1010 B: 0001 C: 1011 D: 0111