12.2 +22-3 + +㎡(n + 1)= n(n + i)(n + 213n + 1)at(a + d) + (a + 2d) + – InterviewSolution

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1.	12.2 +22-3 + +㎡(n + 1)= n(n + i)(n + 213n + 1)at(a + d) + (a + 2d) + + (a + (n-I)d) = 2n(2a + (n-len几1.2.3 t 2 3 4 ..t n tI t 2)1 + 5 + 9 + … + (4,2-3)n(2n-1)2
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