30,000

来源: kzsl60nj 于 2009-12-21 19:15:22 [] [旧帖] [给我悄悄话] 阅读数 : (68 bytes)

(100,000 - 40,000) - (50,000 - 20,000) =
60,000 - 30,000 = 30,000

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