limn→∞[11•4+14•7+17•10+… +1(3n−2)(3n+1)]=______ ．

limn→∞[11•4+14•7+17•10+… +1(3n−2)(3n+1)]=limn→∞13[(1−14)+(14−17)+… +(13N − 2 − 13N + 1) = LiMn →∞ 13 (1 − 13N + 1) = LiMn →∞ 13 · 3n3n3n + 1 = 13

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