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1+2+3+…+n=30013+23+33+…+n3= ? \begin{array} { l l l l l l l l l l } &1 & + &2 & + &3 & + & \ldots & + & n & = & 300 \\ &1^3 & + &2^3 & + &3^3 & + & \ldots & + & n^3 & = & \ ? \\ \end{array} 113++223++333++……++nn3==300 ?
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