
Lv.1
The past is not dead,it is even not past.
签名:Magic is also a reality. The memories are not only the key to the past but…also to the future. we will meet again,no matter at the present or the future.
在 【发起讨论】0.999...是否等于1? 中回复
已知x=0.999......,则
10x=9.999……
10x-x=9.999……-0.9……
9x=9
x=1
代入已知条件得
0.999……=1
这个是外网的做法,本来就不相等
.murderou喵aths.co.uk/0.999.htm
上次看到这个说法还是2年前(
2021-01-27T18:05:55 点赞:0