0.999999...的循環等於1
可是我一直認為是因為太接近了所以直接當成1
可是 1/3=0.3333333......
1/3*3=1=0.9999999999......
也就是說0.9999999999....就是1 而不是近似1= =?
這樣對嘛?
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