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因式分解 ①(a+b)²-12(a+b)+36 =(a+b-6)² ②4x²+4x(m+n)+(m+n)² =(2x)²+4x(m+n)+(m+n)² =(2x+m+n)² 提示:運用完全平方公式,結合整體思想,因式分解
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