推荐回答(5个)
总收入是n^2元, 这个数按20分最后余数r是大于10小于20的数, 如果分的次数是k次. 就有
n^2-r=20k, 10n^2的个位是1,4,6,9,5, 与之对应的r是11,14,16,19,15, 同时20K不仅末尾0而且十位是偶数. 可以逐个尝试(太长, 不展开了), 可以发现满足要求的n是6, 16, 26, 36…. 代入n越大要分的次数k越大。但每种情况下在最后余下的余数总是16, 只能分成10+6. 从余数角度看,所有情况都等同于6头羊,卖了36元, 分了1次,余下16, 为保持总数相等, 甲给乙是2元.
因此这里讨论的不是总数n是多少, 不是n^2以1,4,6,9,5的哪个数结尾, 也不是k是多少轮。讨论的是总剩下10+6的固定模式. 那么无论前面两人平分累计了多少, 最后总是差4. 那么只有唯一一种情况,假给乙2元.
智力题求解有这么一道智力题,有杨树35棵桃树,是杨树的2倍,少五棵球,杨树有多少棵?解答如下,35-5,35-5等于,30,30再乘以2=60杨树的棵数是60颗
乙最后一次分到的钱数是n-n/10*10,或者说n(mod)10,就是n对10取余数。
甲最后一次分到的钱数是10,比乙多了10-n(mod)10 元,
所以甲需要给乙 (10-n(mod)10)/2 元
5块,甲十块乙十块 ,甲先拿,只要乙拿过 说明两个人钱平均 ,甲拿十块后乙不拿,说明甲比乙多拿了十块 ,甲再给乙5块就好 ,答案是五块
n只羊,每只羊卖n元,一共卖了n²元
如果n²是20的倍数,则甲乙两人能够正好分完。
由于n×n=20×……=4×5×……=(2×5×……)×(2×5×……)=(10×……)×(10×……)
所以,当n是10的倍数时,正好分完。
对于n=10k+m(m与k都是大于或等于1的整数,且m是一位数):
n²=(10k+m)²=100k+20km+m²
=20×(5k+㎞)+m²
可知,分不完的部分只与n的个位上的数m有关。
对于m=1~9,m²=1.4.9.16.25.36.49.64.81
被20除的余数分别是:
1.4.9.16.5.16.9.4.1
甲取走10元后有剩余但不够10元的是:那个余16的!(其他的1.4.9.5都不符合这个条件)
所以,最终只剩下m=4和6的两种情况,它们都是最后余16,应该每人8元分完,可是甲拿了10元,剩下6元不够乙的了。所以只能乙取走最后剩余的6元,然后甲再给乙2元,二人就平分了。
结论:为了甲乙两人钱数相等,甲应给乙2元。
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