\[\boxed{\mathbf{756}\mathbf{.}}\]
\[1)\log_{3}27 = \log_{3}3^{3} = 3\]
\[2)\log_{3}81 = \log_{3}3^{4} = 4\]
\[3)\log_{3}3 = \log_{3}3^{1} = 1\]
\[4)\log_{3}1 = \log_{3}3^{0} = 0\]