买书卖书!(求MATH2454,卖ECON1000, MATH1107/2107

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求购:Math2454 textbook: Differential Equations (2ND EDITION) by John Polking, Albert Boggess and David Arnold.

卖:Math1107/2107 textbook & study guide(study guild特别推荐,非常好用): Linear Algebra and its applications (3rd ed.) by David C. Lay, 两本一共 $60 (不讲价,因为我买的是新书,当年花了140刀)
ECON1000 textbook + study guild (micro + macro, 2nd ed.) 其中study guild for macroeconomics 有残,当年买的时候被havenbooks骗了,算三本,都保管的很好,一共 $50 (不讲价,因为当年被骗的好惨,花了110刀)

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