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小学五年级数学鸡兔同笼问题
更新时间: 2020-07-04 00:00:00  

1、鸡兔共100只,鸡的脚比兔少70只,鸡兔各多少只?

解答:分析:若有100只兔子则有400只脚 ,鸡脚就比兔子脚少400, 若有1只鸡,99只兔子 ,则有2只鸡脚,396只兔子脚 ,鸡脚就比兔子脚少394, 400-394=6,也就是鸡每增加一只,鸡脚比兔子脚少的数量就减少6只。

鸡的数量为(100×4)–70÷6=55只。兔的数量为100-55=45只或兔的数量为(100×2)+70÷6=45只。

2、鸡与兔共60只,鸡的脚比兔的脚数多30只,鸡

关键词: 小学 年级 数学 问题

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