1*（1-0.2）*（1+x）=1
x = 1/0.8 -1
x= 0.25
某商品降价20%,后欲回复原价,则要提高的百分数是多少
某商品降价20%,后欲回复原价,则要提高的百分数是多少
数学人气：420 ℃时间：2019-12-09 21:12:43
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