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根號2×a+(根號2-1)b=2×根號2×a-1 (根號2)a+(根號2)b-b=2(根號2)a-1 (根號2)(b-a)=b-1 a,b均為有理數,要使此式成立, 只能:b-a=0,b-1=0 所以:a=b=1 而:-ax>2b 則:-x>2 x
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