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r → G = ∑ k = 1 n m k r k → ∑ k = 1 n m k {\displaystyle {\vec {r}}_{G}={\frac {\displaystyle \sum \limits _{k=1}^{n}m_{k}{\vec {r_{k}}}}{\displaystyle \sum \limits _{k=1}^{n}m_{k}}}}
