设先设商品的原价为x,则商品降价20%后的价格为(1-20%)x,再设提价的百分数为y.
x=x(1-20%)×(1+y),
整理得:1=(1-20%)×(1+y),
解得:y=25%.
故本题答案为:25%.
某商品降价20%后欲恢复原价,则提价的百分数为_%.
某商品降价20%后欲恢复原价,则提价的百分数为______%.
数学人气:692 ℃时间:2020-04-07 12:44:38
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