45-38-27-22-16-13-12-10-7-6-5-4最小的公共倍数

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小学三年级数学练习题及答案:鸡和兔(2)
14:28:35&&&&
  【答案】
  解答鸡兔同笼问题,先假设要求的两个或几个未知量相等,或者先假设要求的两个未知量是同一量,然后按照题中的已知条件来推算,根据数量上出现的矛盾适当置换,求出结果。为了更好的解答鸡兔同笼问题,我们可以用下面的公式:兔数=(实际脚数-每只鸡脚数&鸡兔的总数)&(每只兔子脚数-每只鸡脚数)。  分析:用假设法来解答此题,假设40只都是鸡,那么应有40&2=80(只)脚,而实际有118只脚,多出来118-80=38(只)脚,脚变少就因为是把兔子当成了鸡,如果把一只兔子当成一只鸡,就少4-2=2(只)脚,所以,少38只脚就是把38&2=19(只)兔子当成了鸡,则可以求出鸡、兔各有多少只。点津:解此类问题可以先假设只有一种动物,例如,本题假设都是鸡,算出全是这种动物的脚数,与实际所给的脚数相比较,所得的差就是少算的脚数。
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奥数关键词100以内倍数_百度文库
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五年级奥数下册:第四讲 最大公约数和最小公陪数
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五年级奥数下册:第四讲 最大公约数和最小公陪数&
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奥数关键词十七的倍数和因数有哪些_百度知道
十七的倍数和因数有哪些
十七的倍数和因数有哪些...
十七的倍数和因数有哪些
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17的倍数有17
102……17的因数有1
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