因式分解 复习到提公因式,呆...就这几个破公式害我想了一星期.a^2-b^2=(a+b)(a-b)a^2+2ab+b^2=(a+b)^2a^2-2ab+b^2=(a-b)^2复杂的公式应当都是由最简单最一般的公式循序渐进演变而来,所以肯定有更一般的

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