a = 0.99999.... a - 0.1a = 0.99999... - 0.09999.... = 0.9 0.9a = 0.9 a = 1 입니다. — 괴골 [개물] (@cfr0g) September 28, 2019
a = 0.99999.... a - 0.1a = 0.99999... - 0.09999.... = 0.9 0.9a = 0.9 a = 1 입니다.
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