a²-2a+1=0,则2a²-4a+5

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a²-2a+1=0,则2a²-4a+5a²-2a+1=0,则2a²-4a+5a²-2a+1=0,则2a²-4a+5a²-2a+1=

a²-2a+1=0,则2a²-4a+5
a²-2a+1=0,则2a²-4a+5

a²-2a+1=0,则2a²-4a+5
a²-2a+1=0
(a-1)²=0
a=1
2a²-4a+5=3