小明:“小东,你能告诉我你的生日是几号吗?到时我准给你送生日礼物.”
小东:“我的生日连同上下左右5个日期之和为21.”
小明却认为小东在说谎,请你帮助判断一下,小东有没有说谎?为什么?
人气:337 ℃ 时间:2019-11-04 21:57:25
解答
设小东的生日是x号.
(x-1)+(x+1)+x+(x-7)+(x+7)=21,
解得x=4.2.
因4.2不是整数,所以小东在说谎.
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