设n阶矩阵A 与s阶矩阵B都可逆,求[tex=5.929x2.929]075gCzZzsMRb6HYXYk9X95BT8z7z4e+4OInb7Y8WX7mlX1JqGvQbOIoyVZF9LvTxogPvhwFUoE0aUeAMjFCx5w==[/tex]
因A和B均可逆，作分块阵[tex=7.071x2.929]075gCzZzsMRb6HYXYk9X93BDBKSAxXl8ZFihxG1I6WV2E0lp4yBsw23fjqTiFjNBI/kEo9YjYutFA09yF/1ZlOmJ8YyaATjh28vcGTMbQzQbCJ4ZwV9mtK6SCRSiEVwf0gh9ePa6Ze3djo22RGlVrN+3tzqzKzV95tQSD6/oiBQ=[/tex]，由分块矩阵乘法规则，[tex=22.786x2.929]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[/tex]，于是[tex=5.0x2.786]075gCzZzsMRb6HYXYk9X95BT8z7z4e+4OInb7Y8WX7mlX1JqGvQbOIoyVZF9LvTxvjwNwn2HHXwYEnO2z2VlZw==[/tex]可逆，且[tex=14.357x3.0]075gCzZzsMRb6HYXYk9X96c14hJEyYCrY/NHnamm9AzjsMfiXcz2/LWAFEj7i0qmE4UKQFEEygPspsOQb9gk05QzMYAXAEObZR9eDWlY+jnF+27pEiiSSp5A7r5Xcof9GwAsfCpQmnd909aMAabKxG8Hajxu9jl2UT1oIUZOcHXQ67ymHaPqv/OzyhHLEs6VVaJsXbcSCF6BPym5z3JnOqjuiRfQTf5jzBmkkz9TlY4jsRgyAADHFj8rbyb8LgqRtc5x49emFWin9KvKB5oGBvDrYUQUmF0Qlupv7tSw0tOVllemlYP8BcawTD4BxDa9[/tex]
举一反三
- int x,y,z; x=7; y=8; z=9; if(x>y) x=y; y=z; z=x; printf(“x=%d y=%d z=%d\n”,x,y,z);以上程序段的输出结果是：（） A: x=7 y=8 z=9 B: x=7 y=9 z=7 C: x=8 y=9 z=7 D: x=8 y=9 z=8
- 设n阶矩阵A 与s阶矩阵B都可逆,求[tex=5.929x2.929]075gCzZzsMRb6HYXYk9X9wnlXBOdM81Ai4VHwyypbkMOsILM5b5DtPOUEDyBPeKjBLxoeS2aWJk35clIXAe1sw==[/tex]，
- 【单选题】下面程序的运行结果是 () 。 void main() { int x=7,y=8,z=9; if(x>y) x=y,y=z; z=x; printf("x=%d y=%d z=%d ",x,y,z); } A. x=7 y=8 z=7 B. x=7 y=9 z=7 C. x=8 y=9 z=7 D. x=8 y=9 z=8
- 已知函数定义def demo(a=1,**b):return b则demo(2,x=7,y=8,z=9)的返回值是什么? A: 2 B: (x:7,y:8,z:9) C: (7, 8, 9) D: {'x':7, 'y':8, 'z':9}
- 【计算题】5 ×8= 6×4= 7×7= 9×5= 2×3= 9 ×2= 8×9= 7×8= 5×5= 4×3= 5+8= 6 ×6= 3×7= 4×8= 9×3= 1 ×2= 9×9= 6×8= 8×0= 4×7=
内容
- 0
设x=4,y=8,z=7，表达式x
- 1
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( )。
- 2
set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为？ A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- 3
>>>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']
- 4
设 x=4,y=8,z=7，表达式x<y And (Not y>z) Or z<x的值是