已知[tex=7.786x3.5]59Kc+wt/w/lXK3ncoinsUSvqqnE0sx9/xy4ybs7JgR9sJtVmvlQ1v8M7z44EJLOawXau0wmjNn5HSM8MKtDYq7FdX9sKibXLUnIoypWMDaFdTBmi+dch+hfvgihrdn9a[/tex]，求[tex=1.143x1.286]FOVtga82XBd5siBdZ6kByQ==[/tex]，[tex=1.143x1.286]ub0374DdZHV0UxeIA+j2ug==[/tex]，[tex=1.929x1.286]23/D5zy0nGYqiRdgxOiMkA==[/tex]。

2022-06-01

已知[tex=7.786x3.5]59Kc+wt/w/lXK3ncoinsUSvqqnE0sx9/xy4ybs7JgR9sJtVmvlQ1v8M7z44EJLOawXau0wmjNn5HSM8MKtDYq7FdX9sKibXLUnIoypWMDaFdTBmi+dch+hfvgihrdn9a[/tex]，求[tex=1.143x1.286]FOVtga82XBd5siBdZ6kByQ==[/tex]，[tex=1.143x1.286]ub0374DdZHV0UxeIA+j2ug==[/tex]，[tex=1.929x1.286]23/D5zy0nGYqiRdgxOiMkA==[/tex]。

答案：

解：直接计算[tex=1.143x1.286]FOVtga82XBd5siBdZ6kByQ==[/tex]，[tex=1.143x1.286]ub0374DdZHV0UxeIA+j2ug==[/tex]，[tex=1.929x1.286]23/D5zy0nGYqiRdgxOiMkA==[/tex]是复杂的，这里我们将[tex=0.786x1.286]pi/GsQ3apuRt43V3XQq/tA==[/tex]转化为列向量乘行向量，则可利用结合律简化计算。因为[tex=8.786x3.5]59Kc+wt/w/lXK3ncoinsUSvqqnE0sx9/xy4ybs7JgR9sJtVmvlQ1v8M7z44EJLOawXau0wmjNn5HSM8MKtDYq7FdX9sKibXLUnIoypWMDaEjir6pcSIVu696OO+/57xf[/tex][tex=8.571x3.5]jyVOORWehIbTNQvvtYroWgqFzZPz6OizZb0eCOhKPS4IC8EbsyjoUxcWkv8Lsaj4iWMIENDGLvVImViiuy5aSnc667UuAwJs11Y4GZIRyAPqZ0cDJ1xVL8bxHYjORcwoLV5SLSVY6zg4FOmmJRpIKg==[/tex]，令[tex=4.714x3.5]maXebMJSpWumSwHDpxpHi4Kyxcpd51U3tvfqX83jLJhjih4RfevH44K2r4BqF/E980rv/ym9Io9NIgIWMg8J9Q==[/tex]，[tex=7.071x1.357]00vMxCVyhbyo7Igw2NEGbDZYOsPRW2jYZXn+2nL3dR1VQ/lcYVRySRaD3RGOTS39r2662qB73zCVI8krVNwHlw==[/tex]，则[tex=3.571x1.286]pSpT/0da3Zd5mno7ETYbCQ==[/tex]，且[tex=11.571x3.5]sd89fTRiV2q8Gx4FAEJxnFUbv3vdNEs9rNnjIRfQpVQL8IVKcfpmPz+30qOmgL9P9e77Vax94OikhyGokmLctnvn9nnswkpbdWgTMmUjChoXpKXEbhrOEw3Q338OUiM/yY7+rZe7U0bZvyVluzY9Y1hRJX8mQ3XMmFKpAxxJ+cY=[/tex]，于是[tex=6.286x1.429]vw060y23Sga+74rkImdL1WkXb11Q/h786ruOrW1ZpQ4=[/tex][tex=9.643x1.286]dqsXrbfX8zUf9h78Ip/ElIWFTDM34fWH9S5vT+vwb+Q=[/tex]，[tex=6.857x1.214]eZYB8HayAUnzVq++S+XqoALHFfhvLhoGp0EsCm8n/Ir43+wKEFKtV13+uiI9jPyI[/tex][tex=7.571x1.286]URIFi1D2fxAi8DP7i0t7DrZMUOGcBGCzr4EYgW92XLQ=[/tex]，一般地[tex=8.714x1.429]rX/chZPlG5maZbW8lxybEnAP35ub+MHtkQrDKHiYtB9KSccrFktL/eLgsbtv4QQv[/tex][tex=12.643x1.286]DQPSj6XInanq53EzeeUXZRxRTe1E6lNzx+7BEbRSuWnjOxxebidYVvAJBTrbMCpJ[/tex][tex=8.286x2.0]4f1r8SievUvZBJGzCvUF2pHvz6kRzZvo5y8C3OtdpDzxgXSqMvmrkQs7Fa/UouXI[/tex]

举一反三

内容

0
以下程序段实现的输出是（）。for(i=0;i<;=9;i++)s[i]=i;for(i=9;i>;=0;i--)printf("%2d",s[i]);[/i][/i] A: 9 7 5 3 1 B: 1 3 5 7 9 C: 9 8 7 6 5 4 3 2 1 0 D: 0 1 2 3 4 5 6 7 8 9
1
set1 = {x for x in range(10) if x%2!=0} print(set1) 以上代码的运行结果为？ A: {1, 3, 5, 7, 9} B: {1, 3, 5, 7} C: {3, 5, 7, 9} D: {3, 5, 7}
2
【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]
3
下面是图的拓扑排序的是？(多选)[img=340x240]1802faef6ebcc2a.png[/img] A: 2 8 0 7 1 3 5 6 4 9 10 11 12 B: 2 8 7 0 6 9 11 12 10 1 3 5 4 C: 8 2 7 3 0 6 1 5 4 9 10 11 12 D: 8 2 7 0 6 9 10 11 12 1 3 5 4
4
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]