3的倍数的特征是():因式分解a2-3ab+2b2
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a2-3ab+2b2
=a2-2ab+b2-ab+b2
=(a-b)2-(ab-b2)
=(a-b)2-b(a-b)
=(a-b)(a-b-b)
=(a-b)(a-2b)
答案是:
(a-2b)(a-b)
a2-3ab+2b2
=a2-2ab+b2-ab+b2
=(a-b)2-(ab-b2)
=(a-b)2-b(a-b)
=(a-b)(a-b-b)
=(a-b)(a-2b)
答案是:
(a-2b)(a-b)