差倍问题解答方法及范例
- 时间:2020-04-16 18:10:39
- 分类:数学世界
- 阅读:119 次
差倍问题解答方法及范例。差倍问题:已知两个数的差,及两个数的倍数关系,求两个数各是多少的应用题。解题规律:两个数的差÷(倍数-1 )= 标准数 标准数×倍数=另一个数。
例:甲乙两根绳子,甲绳长 63 米 ,乙绳长 29 米 ,两根绳剪去同样的长度,结果甲所剩的长度是乙绳 长的 3 倍,甲乙两绳所剩长度各多少米? 各减去多少米?
分析:两根绳子剪去相同的一段,长度差没变,甲绳所剩的长度是乙绳的 3 倍,实比乙绳多( 3-1 )倍,以乙绳的长度为标准数。列式( 63-29 )÷( 3-1 ) =17 (米)…乙绳剩下的长度, 17 × 3=51 (米)…甲绳剩下的长度, 29-17=12 (米)…剪去的长度。
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