∑ i = 1 m a i = ∑ j = 1 n b j , {\displaystyle \sum _{i=1}^{m}{a_{i}}=\sum _{j=1}^{n}{b_{j}},}
тест E = m c 2 {\displaystyle E=mc^{2}}
k < N {\displaystyle k<N}
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