(a+b)²-2a-2b+1因式分解
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(a+b)²-2a-2b+1因式分解(a+b)²-2a-2b+1因式分解(a+b)²-2a-2b+1因式分解(a+b)²-2a-2b+1=(a+b)²
(a+b)²-2a-2b+1因式分解
(a+b)²-2a-2b+1因式分解
(a+b)²-2a-2b+1因式分解
(a+b)²-2a-2b+1
=(a+b)²－2(a＋b)＋1
=(a+b－1)²
=a^2+b^2 +2ab-2a-2b+1
=(a+b)²－2(a＋b)＋1
=(a+b－1)²
=a^2+b^2 +2ab-2a-2b+1
=(a+b)²－2(a＋b)＋1
=(a+b－1)²