设钢笔的价格为x元
3x-x=19
2x=19
x=9.5
钢笔9.5元 文具盒28.5元
文具盒的价格是钢笔的3倍.钢笔比文具盒便宜19元.文具盒几元?钢笔几元?
文具盒的价格是钢笔的3倍.钢笔比文具盒便宜19元.文具盒几元?钢笔几元?
数学人气：526 ℃时间：2019-10-10 04:46:50
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