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Y(k)=Q(k)*(t+Sum(Q(j), 1<=j<=m) ÆäÖÐ1<=k<=m
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Y[[k]] = Q[[k]]*(t + Sum[Q[[j]], {j, 1, m}])

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D[Q[[k]]*(t + Sum[Q[[j]], {j, 1, m}]), Q[[k]]]

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t + Sum[Q[[j]], {j, 1, m}]


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