a²-b²-2a+1因式分解

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a²-b²-2a+1因式分解a²-b²-2a+1因式分解a²-b²-2a+1因式分解(a-1)²-b²

a²-b²-2a+1因式分解
a²-b²-2a+1因式分解

a²-b²-2a+1因式分解

(a-1)²-b²