若实数a满足x²-2x-1=0,则2a²-4a+5

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若实数a满足x²-2x-1=0,则2a²-4a+5若实数a满足x²-2x-1=0,则2a²-4a+5若实数a满足x²-2x-1=0,则2a²

若实数a满足x²-2x-1=0,则2a²-4a+5
若实数a满足x²-2x-1=0,则2a²-4a+5

若实数a满足x²-2x-1=0,则2a²-4a+5
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