a²-b²-2a+1因式分解a²-b²-2a+1

a²-b²-2a+1因式分解
a²-b²-2a+1

a²-b²-2a+1
=a²-2a+1-b²
=(a-1)²-b²
=（a-1+b）（a-1-b）
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