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計sqrt(3)為根三 反證法,設sqrt(3)為有理數,計為p/q,p,q互質 所以3=p*p/q*q 3q*q=p*p 所以p為3的倍數,計為3l 代入有q*q=3*l*l 所以q也為3的倍數,與p,q互質衝突
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