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设 $\left|\begin{array}{lll}a_1 & a_2 & a_3 \\ b_1 & b_2 & b_3 \\ c_1 & c_2 & c_3\end{array}\right|=3$ ，则 $\left|\begin{array}{lll}2 b_1 & 2 b_2 & 2 b_3 \\ 2 a_1 & 2 a_2 & 2 a_3 \\ 2 c_1 & 2 c_2 & 2 c_3\end{array}\right|=$
                        
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