这本字典进价是x
15*0.8-x=0.2x
1.2x=12
x=10元
一本字典定价15元8折卖出还赚20%这本字典进价是多少
一本字典定价15元8折卖出还赚20%这本字典进价是多少
数学人气：326 ℃时间：2020-03-24 01:30:18
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