有限数学 示例

Two matrices can be multiplied if and only if the number of columns in the first matrix is equal to the number of rows in the second matrix. In this case, the first matrix is ${\displaystyle 2\times 2}$ and the second matrix is ${\displaystyle 2\times 1}$.

将第一个矩阵中的每一行乘以第二个矩阵中的每一列。