Cho hai ma trận . $A=\left[\begin{array}{ccc}1& -2& 3\\ 1& \mathrm{ }\mathrm{ }\mathrm{ }0& 1\\ 1& -1& 1\end{array}\right]$ Khi đó ma trận là kết quả nào sau đây $A^2$

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the word that has the underlined part pronounced differently from the rest:  

  punch                  lunch                  each                   ache

• Choose the word that has the underlined part pronounced differently from the rest:  

  resume                 install                      set                      security

• Choose the best answer for the following sentence:

  I don't think she'll ever ____________ the shock of her mother's death.
   

• Choose the best answer for the following sentence:

  The little girl wouldn't go into the sea ________ her father went too.
   

• Choose the best answer for the following sentence:

  This book will provide you ___________ all the information you need.
   

• Choose the best answer for the following sentence:

  Scientists have discovered a close ____________ between smoking and several diseases.
  
  

• Choose the best answer for the following sentence:

  You will not succeed ___________ working harder.
  
  

• Choose the best answer for the following sentence:

  If man were less greedy, more animal species could avoid ___________
   

• Choose one sentence that has the same meaning as the root one:

  Don't ask her for the money or she won't give it to you.
  
  

• Choose one sentence that has the same meaning as the root one:

  Jane says she oughtn't to eat so many sweet things.