甲乙两个书架共有图书3000本,甲架上图书本数的5分之2比乙架上图书本数的4分之1多420本,两个书架各有图书
假设甲架上是X本,则乙架是3000-X本2/5X - 1/4(3000-X) = 4202/5X - 750 1/4X = 420(2/5 1/4)X = 420 75013/20X = 1170X = 1170 * 20/13X = 18003000 - X = 3000 - 1800 = 1200答案:甲有1800本,乙有1200本。
假设甲架上是X本,则乙架是3000-X本2/5X - 1/4(3000-X) = 4202/5X - 750 1/4X = 420(2/5 1/4)X = 420 75013/20X = 1170X = 1170 * 20/13X = 18003000 - X = 3000 - 1800 = 1200答案:甲有1800本,乙有1200本。
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