售价是增加、降低,还是持平

INSIDE AND OUTSIDE THE CLASSROOM（2004）

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Abstract

问题:某种商品4月份比3月份增加了20%,而5月份售价比4月份售价减少了20%.那么,5月份比3月份的售价是增加、降低,还是持平?(北京市迎春杯数学竞赛题)

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