题目
题目
单项选择题

Let \( A = \begin{bmatrix} 2 & -1 \\ -3 & -4 \end{bmatrix}\), \( B = \begin{bmatrix} -2 & 0 \\ -1 & 3 \end{bmatrix}\).Which of the following statements is correct?

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思路分析
The problem presents A and B and asks which statement is correct, but the provided answer options are missing. Despite that, we can independently compute the product AB to verify any candidate statement. First, write the matrices: A = [[2, -1], [-3, -4]] and......Login to view full explanation

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Vector a =  10      12 And vector b =  2 3   Whats the value of a*b ?  (* is matrix multiplication);  Please enter a number with no decimals.  

Question at position 13 [1−12][[4−10][23]+[1001−11]]=\begin{bmatrix} 1 & -1 & 2 \\ \end{bmatrix} \left[ \begin{bmatrix} 4 \\ -1\\ 0 \end{bmatrix} \begin{bmatrix} 2 &3 \\ \end{bmatrix} + \begin{bmatrix} 1 & 0 \\ 0 & 1 \\ -1 & 1 \end{bmatrix} \right] =[2−34810]\begin{bmatrix} 2 & -3 \\ 4 & 8 \\ 1 & 0 \end{bmatrix}none of the above[29−3]\begin{bmatrix} 2 & 9 & -3 \\ \end{bmatrix}[5−7]\begin{bmatrix} 5 \\ -7 \end{bmatrix}[912]\begin{bmatrix} 9 & 12 \\ \end{bmatrix}

Question at position 12 [1−134][025−3]=\begin{bmatrix} 1 & -1 \\ 3 & 4 \end{bmatrix} \begin{bmatrix} 0 & 2 \\ 5 & -3 \end{bmatrix} =[−5520−6]\begin{bmatrix} -5 & 5 \\ 20 & -6 \end{bmatrix}[68−4−17]\begin{bmatrix} 6 & 8 \\ -4 & -17 \end{bmatrix}[−2838]\begin{bmatrix} -2 & 8 \\ 3 & 8 \end{bmatrix}[4−106]\begin{bmatrix} 4 & -1 \\ 0 & 6 \end{bmatrix}[0−215−12]\begin{bmatrix} 0 & -2 \\ 15 & -12 \end{bmatrix}

Define the matrices A=\left[\begin{array}{ccc} 2&3\\ {1}&{-5}\end{array}\right] and B=\left[\begin{array}{ccc} 4&3&6\\ {1}&2.8&3\end{array}\right]. What is the entry in the first row and second column of AB?

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