• 2022-06-09
    将矩阵[img=156x71]18030731cedc0d7.png[/img]化为行最简形应使用的语句是
    A: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}}//MatrixForm RowReduce[A]
    B: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}} RowReduce[A]
    C: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}} Rowreduce[A]
    D: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}} RowSimplify[A]
  • B

    内容

    • 0

      (1)5 7 9 11() () ()()(2)26 23 20 17()() 8()(3)1 2 4 7 11() () 29(4)7 3 8 3 9 3()()(5)1 1 2 3 5 8()()

    • 1

      The output of the following code is ____.<br/>count = 1; /* initialize count */ while (count &lt;= 10) { printf("%d ",count); count++; /* increment count */ } A: 1 1 1 1 1 1 1 1 … B: 1 2 3 4 5 6 7 8 9 C: 1 2 3 4 5 6 7 8 9 10 D: 1 2 3 4 5 6 7 8 9 10 11

    • 2

      向量(2,1,-1)和向量(1,-1,2)的叉积是( ) A: (1,5,-3) B: (1,-5,3) C: (1,-5,-3) D: (-1,-5,-3)

    • 3

      曲面x2/3+y2+z2/5=1上M点的法向量与三个坐标轴正向的夹角相等,M点的坐标有两个答案分别是:() A: (1,-1/3,-5/3)和(1,1/3,5/3) B: (1,-1/3,-5/3)和(1,1/3,-5/3) C: (-1,-1/3,-5/3)和(1,1/3,5/3) D: (-1,-1/3,-5/3)和(1,1/3,-5/3)

    • 4

      【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]