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无限循环小数0.9等于1吗？
这里有3种证明：
1、因为1/3=0.3333......，等式两边同乘以3，得出1=0.999999.......。
2、因为X=0.99999.......，等式两边同乘以10，得出10X=9.99999.....=9+0.99999......=9+X，所以10X-9X=9，X=1，1=0.99999......
3、.......
这里有3种证明：
1、因为1/3=0.3333......，等式两边同乘以3，得出1=0.999999.......。
2、因为X=0.99999.......，等式两边同乘以10，得出10X=9.99999.....=9+0.99999......=9+X，所以10X-9X=9，X=1，1=0.99999......
3、.......
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