a²-2a-b²+1因式分解过程
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a²-2a-b²+1因式分解过程
a²-2a-b²+1因式分解过程
a²-2a-b²+1因式分解过程
a²-2a-b²+1
=(a²-2a+1)-b²
=(a-1)²-b²
=(a-1-b)(a-1+b)
a²-2a-b²+1=( a²-2a+1 )-=(a-1)²-b² =( a-1+b )(a-1-b)
a²-2a-b²+1=（a-1)²-b²=(a+b-1)(a-b-1)