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(x-1)²=2x²-6x+4 x²-2x+1=2x²-6x+4 x²-4x+3=0 x=1,x=3 底數x-1>0且≠1 所以x>1且≠2 所以x=3 真數2x²-6x+4>0 x=3成立 所以x=3
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