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如果有x+y=z,其中x是有理數,y是無理數,可以設x=a/b(a,b都是整數). 用反證法,假設z是有理數,那麼z可以表示成分數的形式,即z=c/d(c,d是整數) y=z-x=c/d-a/b=(cb-ad)/bd,而(cd-ad)/bd是分數,說明y是有理數,與題設衝突,所以假設不成立,故z是無理數
是的!
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