Gouvon
13 years ago
證明0.9999...=1, 設x=0.9999...,10x=9.9999...,10x-x =9.9999...-0.9999... ,9x =9 ,x=1.
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掰噗~ says
13 years ago
(筆記筆記) 8-)
ChiChi
13 years ago
(highfive)
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