一减二分之一加二分之一减三分之一……加九十九分之一减一百分之一
人气:134 ℃ 时间:2019-10-17 05:32:52
解答
从第二个开始,都会跟随后的消掉,所以 剩下 1- (1/100)= 99/100
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