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5+根號5和5-根號5 2+根號2和3-根號2
一個無理數與另一有理數的和差仍然是無理數,很顯然,如果A表示無理數-2.5π,那麼與A相距4的點表示的數是: -2.5π-4或-2.5π+4 這兩個數顯然是無理數
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