摘要：
250pt TheArithmeticProgressionThere are three numbers (a, b, c), they represent (x, y, z), respectively.According to the equation y – x = z – y. We can get three equations: x = 2 * y – z; y = 0.5 * (x... 阅读全文
posted @ 2013-09-18 13:37
FlyingPenguin
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