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奥数天天练，列方程解应用题又慢又易出错？你的未知数设错了
09-1列方程解应用题：甲、乙、丙共有100本课外书，甲的本数除以乙的本数，丙的本数除以甲的本数，商都是5，余数都是为1。求甲有多少本？
小学奥数提分天天练29/65
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