$\begin {array} {1 1} (1)\;172.8 \times 10^{-4} & \quad (2)\;2.1\: \pi^2\: 10^{-2} \\ (3)\;1.57 \times 10^{-2} & \quad (4)\;1728 \times 10^{-2} \end {array}$

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