solve If the sequence a1, a2, a3, … an form an A. P., then a1^2 - a2^2 + a3^2 - … + a2n – 1^2 - a2n^2 =
solve If the sequence a1, a2, a3, … an form an A. P., then a1^2 - a2^2 + a3^2 - … + a2n – 1^2 - a2n^2 =
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