• 2022-05-28
    设[tex=16.357x2.786]YHIKtHtTy6YeetIBukGWJ/+4CPibC+H1hzFh9VOwgL0Bizkf8RJ2uRiNb5rHJrgKt2BwZDnJFc5ALxj9RvU1/OLs5g6p9Kjqme8rF6hmC4Y74qOadCoUjL5fNN1oB8ebO2s6zlTXGJ41K+xQBwFZCi71xhjwwDaFx2uwTAlonw3wdqT0SjtZXN606I7a/MbEw/Lh9c8eQtPp6iRaG2jPWQ==[/tex],求[tex=5.643x1.429]96v/QovsZC+SUffULwqQniGxm4DtIVeawHN7nT6grOsyPiza2f9Ce2Q6M4a+Y9E6E/T0cFGKEGohFREElJshqA==[/tex]
  • 分析:对于矩阵[tex=5.143x1.5]YHIKtHtTy6YeetIBukGWJ+JTwta6G3wlG5h31QW0nhlV65ozz+4PBLuEz9C0tc0A01hwLT2FmBclBlSLvDVQqw==[/tex]和矩阵[tex=4.857x1.5]MVsnGUDjteIUZsyQP8wk5ks97mL/MIqsfB8NSRQDRjoUQtDQ3zhKDFwoyuk4wehQpe3WntGzxh9Ss/aSOIs28Q==[/tex],由定义可计算矩阵的乘积[tex=7.643x1.5]g7wyRhWruAXx0N1FMyvESpCXQwS8entw21yvnJatt9jjN4143qY6iLxt44MgWEd79cXUIZKgY9XePxnWhUrfcVu/hUrGtCXHlyFNzCfVhV0=[/tex],有[tex=17.714x2.786]qC5UZo7gMcf8oZMkdWOuMtdkyRWz07h8Pfrk8zLnDht8bMyyxihoqu0qNqMhAhvcMRUjpRb53scJzsVzmeqj6/ZBugPWjMCUuldgxUHYetCEK4BH4jecJLEnGmMNav5Y[/tex].解:[tex=21.071x2.786]CwoJO6GAbRSqgCABdHjq5Eq08KraWT6lG2sl+6BRTl3xJTuMN0I27jVphWRtNpM3Orle8i5ixS5J43QDMcS+3ZZKdDUZFoKy1kyLFHOY1IZUQFDLI6ZUdNgqkLLeqIPvgorl1g2Bq5H9kNwjIkj++1OSZGXK7J+zJEUXyP/0OgOI5oNV6Hr4DZSG1m8StBhINhYsf7nQji5mTdE3Vg7AbPrlAqyfbQbf7IQFQvbrXMeYTArolvBLDOUCqy42ZRgYOJSadxgitDrVj0t+uteIjA==[/tex],[tex=23.643x2.786]d3oLifbI5s6LUr2fYOYYY8Y2xyb5xJiEtg1/ysdTNx0sgP50LrI2orh6iCRRbde+ckhl9WppCQ5jJNxkVUg86AZX5u3FHphYv7bjf/r1t3xvCnBoZlga8gBy5gsbO7AVc+jzHZJsgNH9jYeLj/yND9fcQ4Jmc/Uvw68TiwfjZwhO84ZdB5SPpSrG0O4kUiucve5447bZGAAd6NB03HL1mJucF/izIjbLCMppXjsLUPsxdWAtysuWf/h1I1jExWt5Uoyoan1ageeSJFCgAPRGz8xqnGLLcmJU2XtutDBla8I=[/tex],[tex=20.571x2.786]rwGRC7Vu1X4H04Rqs2EGk56XgIeSnydTbr2TUmnbwdN6BHLIQ0+MOnGkrFaMVqsA7EB3+0EO0SOeajkezChGS+3yTR+L4PCKULyJEq2xGvRiPex5XBa/ROiEEEM7Jd/mVqbdIv2EbrzNqLgWgvgkMWc38X5279XkBFJjHswLLz1Lrk5e1bmamZarKqS1HdU3ymFCw8w89xpyFO82DaqBKD0KSrg/vDxy98x3d8glUz48GYJEAaaPrsLRasGAG/fen8mtIIjxDeApow+AYathPg==[/tex]

    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

      输出九九乘法表。 1*1=1 2*1=2 2*2=4 3*1=3 3*2=6 3*3=9 4*1=4 4*2=8 4*3=12 4*4=16 5*1=5 5*2=10 5*3=15 5*4=20 5*5=25 6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36 7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49 8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64 9*1=9

    • 3

      下面语句的输出结果是?range(len('HelloWorld')) A: [1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11] B: 11 C: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] D: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

    • 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