Calculate the following matrix vector product (1234)(2−1)=(ab)\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix} \begin{pmatrix} 2 \\ -1 \end{pmatrix}=\begin{pmatrix} a \\ b \end{pmatrix}, where a=[Fill in the blank], and b=[Fill in the blank], 多项填空题

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