a²-b²-2a+1怎么算?

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a²-b²-2a+1怎么算?
a²-b²-2a+1怎么算?

a²-b²-2a+1怎么算?
a²-b²-2a+1
=a²-2a+1-b²
=(a-1)²-b²
=(a-1+b)(a-1-b)